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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.
0
1, 6, 17, 44, 97, 208, 429, 884, 1814
OFFSET
1,2
LINKS
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
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 21 2015
STATUS
approved