A259972 Triangle read by rows: coefficients psi(n,k) arising from the study of completely transitive graphs on n nodes.

1, 2, 1, 5, 7, 3, 20, 58, 60, 21, 179, 838, 1458, 1113, 315, 4082, 25171, 60780, 72135, 42210, 9765, 218225, 1610977, 4871193, 7745115, 6844635, 3193155, 615195

Offset

1,2

Links

Table of n, a(n) for n=1..28.

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,
2,1,
5,7,3,
20,58,60,21,
179,838,1458,1113,315,
4082,25171,60780,72135,42210,9765,
218225,1610977,4871193,7745115,6844635,3193155,615195,
...

Crossrefs

Cf. A259971, A259970.

Diagonals include A005331, A005332.

Row sums are A005016.

Sequence in context: A093545 A293845 A249265 * A193762 A268489 A198422

Adjacent sequences: A259969 A259970 A259971 * A259973 A259974 A259975

Keyword

nonn,more,tabl

Author

N. J. A. Sloane, Jul 11 2015

Status

approved