A262297 Length of longest chain of nonempty proper inverse subsemigroups of the monoid of partial injective orientation-preserving functions of a chain with n elements.

1, 6, 17, 44, 97, 208, 429, 884, 1814

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: A232567 A062020 A066183 * A048746 A026382 A054492

Adjacent sequences: A262294 A262295 A262296 * A262298 A262299 A262300

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 21 2015

Status

approved