A362898 Number of nonisomorphic unordered triples of endofunctions on an n-set.

1, 1, 13, 638, 118949, 42483668, 23524514635, 18477841853059, 19526400231564564, 26714255854638149145, 45938634690184528585855, 96990967579564469350287613, 246664446832722382952639028437, 743740463651636548809953508690270, 2623456914417867939801667337352637825

Offset

0,3

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 A362897.

Cf. A001372, A054745.

Sequence in context: A351507 A067407 A143734 * A316331 A217380 A068232

Adjacent sequences: A362895 A362896 A362897 * A362899 A362900 A362901

Keyword

nonn

Author

Andrew Howroyd, May 10 2023

Status

approved