%I #11 Aug 13 2020 12:16:47
%S 1,1,2,3,0,4,1,7,8,13,2,26,9,49,38,107,28,228,49,501,324,1101,258,
%T 2766,469,5845,3790,13555,2376,35624,5813,75807,38036,180213,30482,
%U 480782,69593,1047429,485658,2542453,385020,6794812,914105,15114481,9570844,36794329,5212354,101089306,12602653,222317557
%N Multiplicity of the zero at x=1 of the characteristic polynomial P_n^C.
%H M. Assis, J. L. Jacobsen, I. Jensen, J.-M. Maillard and B. M. McCoy, <a href="http://arxiv.org/abs/1406.5566">Integrability vs non-integrability: Hard hexagons and hard squares compared</a>, arXiv preprint 1406.5566 [math-ph], 2014. See Eq. A.11.
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Sep 18 2014