A262295 Length of longest chain of nonempty proper inverse subsemigroups of the symmetric inverse monoid.

1, 5, 15, 39, 96, 229, 533, 1217, 2742

Offset

1,2

Links

Table of n, a(n) for n=1..9.

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

Crossrefs

Sequence in context: A084447 A357290 A099035 * A034182 A348885 A132985

Adjacent sequences: A262292 A262293 A262294 * A262296 A262297 A262298

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 21 2015

Status

approved