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A246997 Multiplicity of the zero at x=1 of the characteristic polynomial P_n^C. 0
1, 1, 2, 3, 0, 4, 1, 7, 8, 13, 2, 26, 9, 49, 38, 107, 28, 228, 49, 501, 324, 1101, 258, 2766, 469, 5845, 3790, 13555, 2376, 35624, 5813, 75807, 38036, 180213, 30482, 480782, 69593, 1047429, 485658, 2542453, 385020, 6794812, 914105, 15114481, 9570844, 36794329, 5212354, 101089306, 12602653, 222317557 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..50.

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 [math-ph], 2014. See Eq. A.11.

CROSSREFS

Sequence in context: A215591 A025639 A195827 * A208384 A327800 A286236

Adjacent sequences:  A246994 A246995 A246996 * A246998 A246999 A247000

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 18 2014

STATUS

approved

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Last modified July 1 08:17 EDT 2022. Contains 354953 sequences. (Running on oeis4.)