A262291 a(n) = Sum_k k!*A262292(n,k).

0, 2, 24, 330, 5382, 98250

Offset

2,2

Links

Table of n, a(n) for n=2..7.

P. J. Cameron, M. Gadouleau, J. D. Mitchell, and Y. Peresse, Chains of subsemigroups, arXiv preprint arXiv:1501.06394 [math.GR], 2015. See Table 1.

Crossrefs

Cf. A262292.

Sequence in context: A209290 A333715 A081065 * A043699 A220317 A220340

Adjacent sequences: A262288 A262289 A262290 * A262292 A262293 A262294

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 21 2015

Extensions

Missing term a(3) added by Pontus von Brömssen, Jul 08 2024

Status

approved