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A246995 Multiplicity of the zero at x=1 of the characteristic polynomial P_n^F. 0
1, 1, 1, 2, 1, 3, 2, 5, 3, 8, 9, 17, 20, 33, 45, 74, 105, 167, 250, 389 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..20.

M. Assis, J. L. Jacobsen, I. Jensen, J.-M. Maillard and B. M. McCoy, Integrability vs non-integrability: Hard hexagons and hard squares compared, arXiv preprint 1406.5566, 2014. See Eq. A.4.

CROSSREFS

Sequence in context: A053602 A272912 A123231 * A238782 A058736 A097451

Adjacent sequences:  A246992 A246993 A246994 * A246996 A246997 A246998

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Sep 18 2014

EXTENSIONS

The a(1) term looks wrong to me. I have written to the authors.

STATUS

approved

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Last modified October 20 20:24 EDT 2019. Contains 328273 sequences. (Running on oeis4.)