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A003425 n! times number of posets with n elements.
(Formerly M4294)
0
1, 1, 6, 114, 5256, 507720, 93616560, 30894489360, 17407086641280, 16152167106391680, 23990233574783750400, 55735096448700749203200 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

K. K.-H. Butler, A Moore-Penrose inverse for Boolean relation matrices, pp. 18-28 of Combinatorial Mathematics (Proceedings 2nd Australian Conf.), Lect. Notes Math. 403, 1974.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..11.

Index entries for sequences related to posets

CROSSREFS

Cf. A001035.

Sequence in context: A274786 A317172 A278752 * A052465 A229582 A113015

Adjacent sequences:  A003422 A003423 A003424 * A003426 A003427 A003428

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified April 16 18:53 EDT 2021. Contains 343050 sequences. (Running on oeis4.)