A286867 - OEIS

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A286867

Number of idempotents in the twisted planar partition monoid PP_n^tau.

1

1, 1, 6, 44, 362, 3226, 30488, 301460, 3090020, 32618046, 345515557

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OFFSET

0,3

COMMENTS

Values were computed using the Semigroups package for GAP.

LINKS

Table of n, a(n) for n=0..10.

Igor Dolinka, James East, Athanasios Evangelou, Desmond FitzGerald, Nicholas Ham, James Hyde, Nicholas Loughlin, Idempotent Statistics of the Motzkin and Jones Monoids, arXiv:1507.04838 [math.CO], 2015-2016.

CROSSREFS

Cf. A225797, A289620.

Sequence in context: A052204 A147688 A090442 * A361649 A084965 A203159

Adjacent sequences: A286864 A286865 A286866 * A286868 A286869 A286870

KEYWORD

nonn,more

AUTHOR

James East, Oct 05 2017

STATUS

approved