A211166 - OEIS

A211166

Euler characteristic of relative homology of some varieties related to cluster algebras of type D.

4, 26, 122, 572, 2754, 13372, 65350, 321314, 1587646, 7876706, 39213336, 195797006, 980139194, 4917428112, 24719569686, 124480093754, 627818178180, 3170837715984

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OFFSET

2,1

COMMENTS

The true Euler characteristic alternates in sign. This sequence is the absolute value.

LINKS

Table of n, a(n) for n=2..19.

CROSSREFS

Cf. A171711 (similar sequence in type A).

Sequence in context: A147621 A246854 A267847 * A245460 A261738 A363648

Adjacent sequences: A211163 A211164 A211165 * A211167 A211168 A211169

KEYWORD

nonn,more

AUTHOR

F. Chapoton, Jan 30 2013

STATUS

approved