A362901 - OEIS

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A362901

Number of nonisomorphic unordered triples of fixed-point-free endofunctions on an n-set.

2

1, 0, 1, 22, 3935, 1497568, 883538845, 725601878962, 792072162839065, 1110677779035583912, 1947266694667001733208, 4175906998639267840682727, 10757238370963150080155796720, 32785728540392233760236496299048, 116709223477757580428169966318431329

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

COMMENTS

Isomorphism is up to permutation of the elements of the n-set.

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..50

CROSSREFS

Column k=3 of A362899.

Sequence in context: A128854 A114942 A155885 * A218719 A109776 A110802

Adjacent sequences: A362898 A362899 A362900 * A362902 A362903 A362904

KEYWORD

nonn

AUTHOR

Andrew Howroyd, May 10 2023

STATUS

approved