OFFSET
0,3
LINKS
James East, A. Vernitski, Ranks of ideals in inverse semigroups of difunctional binary relations, arXiv preprint arXiv:1612.04935 [math.GR], 2016.
J. East and A. Vernitski, Ranks of ideals in inverse semigroups of difunctional binary relations, Semigroup Forum (to appear).
EXAMPLE
Triangle begins:
1,
1,2,
1,3,3,
1,7,8,8,
1,15,27,21,19,
1,31,92,84,60,57,
1,63,303,385,266,213,209,
1,127,968,1768,1419,986,889,884,
1,255,3027,7901,8049,5446,4313,4154,4148,
1,511,9332,34364,45810,33883,23888,21405,21163,21156,
1,1023,28503,146265,256576,223439,150465,121186,116342,115993,115985,
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Nov 13 2017
STATUS
approved