A362651 Number of nonisomorphic multisets of involutions on an n-set with n involutions.

1, 1, 3, 7, 74, 1532, 478902, 1561933881, 74069769621942, 44786847731274624558, 454923769422460614413179958, 75365529411732671264995255795387368, 250450659464630320300793563353757730632329596, 16712244262184960007363857016489055045260380508520606142

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..40

Crossrefs

Main diagonal of A362648.

Cf. A362382, A362647.

Sequence in context: A075611 A191485 A119572 * A172995 A325476 A234536

Adjacent sequences: A362648 A362649 A362650 * A362652 A362653 A362654

Keyword

nonn

Author

Andrew Howroyd, May 01 2023

Status

approved