OFFSET
0,5
COMMENTS
Explicit formulas for columns k=0,1,2,3,4 are given in the Butler-Markowsky link.
LINKS
K. K.-H. Butler and G. Markowsky, The Number of Maximal Subgroups of the Semigroup of Binary Relations, Kyungpook Math. J. Vol 12, June 1972.
EXAMPLE
Triangle begins:
1;
1, 1;
1, 7, 3;
1, 37, 66, 19;
1, 175, 975, 990, 219;
1, 781, 12090, 32575, 23345, 4231;
1, 3367, 135903, 866550, 1514610, 814903, 130023;
...
CROSSREFS
KEYWORD
AUTHOR
Geoffrey Critzer, May 22 2023
STATUS
approved