A055532 Number of labeled order relations on n nodes in which longest chain has 3 nodes.

6, 108, 2310, 65700, 2583126, 142259628, 11012710470, 1196543891700, 181782466114326, 38435786111785788, 11256358984173551430

Offset

3,1

References

L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 60.

Links

Table of n, a(n) for n=3..13.

Crossrefs

A column or diagonal of triangle in A342587.

Sequence in context: A230540 A295791 A361728 * A369532 A288148 A010563

Adjacent sequences: A055529 A055530 A055531 * A055533 A055534 A055535

Keyword

nonn

Author

N. J. A. Sloane, Jul 10 2000

Extensions

Extended to n=13 by Brendan McKay, Mar 16 2021

Status

approved