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%I #11 Mar 03 2021 12:15:30
%S 0,-4,8,36,-144,236,-328,580,-1088,1836,-3096,5668,-10736,20668,-40328
%N Low temperature series associated with square lattice.
%H M. F. Sykes and M. E. Fisher, <a href="https://doi.org/10.1016/0031-8914(62)90080-0">Antiferromagnetic susceptibility of the plane square and honeycomb Ising lattices</a>, Physica, 28 (1962), 919-938.
%F G.f.: (2*(1-y^2)*u(y^2) + 4*((2-y)^2*xi(y^2)-1)) / (1+y)^2, where u(x) is the g.f. of A002909 and xi(x) is the g.f. of A002979. - _Andrey Zabolotskiy_, Mar 03 2021
%Y Cf. A002909, A002979, A002907.
%K sign,more
%O 1,2
%A _N. J. A. Sloane_
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