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A055532 Number of labeled order relations on n nodes in which longest chain has 3 nodes. 1
6, 108, 2310, 65700, 2583126, 142259628 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

REFERENCES

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

LINKS

Table of n, a(n) for n=3..8.

CROSSREFS

A column or diagonal of triangle in A008285.

Sequence in context: A099138 A230540 A295791 * A288148 A010563 A114310

Adjacent sequences:  A055529 A055530 A055531 * A055533 A055534 A055535

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 10 2000

STATUS

approved

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Last modified October 18 12:52 EDT 2018. Contains 316321 sequences. (Running on oeis4.)