A055534 - OEIS

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A055534

Number of labeled order relations on n nodes in which longest chain has n-2 nodes.

1

1, 86, 2310, 42960, 712320, 11481120, 186671520, 3116534400, 53907638400, 970417324800, 18217668268800

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OFFSET

3,2

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: A224054 A224307 A224371 * A230783 A017802 A035738

Adjacent sequences: A055531 A055532 A055533 * A055535 A055536 A055537

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 10 2000

EXTENSIONS

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

STATUS

approved