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A259971
Triangle read by rows: coefficients xi(n,k) arising from the study of completely transitive graphs on n nodes.
3
1, 1, 1, 2, 5, 3, 10, 40, 51, 21, 122, 644, 1236, 1029, 315, 3346, 21496, 54060, 66780, 40635, 9765, 196082, 1471460, 4527228, 7328580, 6596100, 3134565, 615195
OFFSET
1,4
LINKS
E. Andresen, K. Kjeldsen, On certain subgraphs of a complete transitively directed graph, Discrete Math. 14 (1976), no. 2, 103-119.
Hsien-Kuei Hwang, Emma Yu Jin, Michael J. Schlosser, Asymptotics and statistics on Fishburn Matrices: dimension distribution and a conjecture of Stoimenow, arXiv:2012.13570 [math.CO], Dec 25 2020, p. 29.
EXAMPLE
Triangle begins:
1,
1,1,
2,5,3,
10,40,51,21,
122,644,1236,1029,315,
3346,21496,54060,66780,40635,9765,
196082,1471460,4527228,7328580,6596100,3134565,615195,
...
CROSSREFS
Diagonals include A005321, A005330
Row sums are also A005321.
Sequence in context: A138765 A097753 A120860 * A091809 A110315 A275677
KEYWORD
nonn,more,tabl
AUTHOR
N. J. A. Sloane, Jul 11 2015
STATUS
approved