%I #24 Feb 15 2022 14:00:57
%S 4,48,840,19080,501712,14383256,436774992,13826204264
%N High-temperature coefficients for internal energy for spin-1/2 Ising model on b.c.c. lattice.
%H M. E. Fisher and M. F. Sykes, <a href="https://doi.org/10.1016/0031-8914(62)90081-2">Antiferromagnetic susceptibilities of the simple cubic and body-centered cubic Ising lattices</a>, Physica, 28 (1962), 939-956.
%H <a href="/index/Ba#bcc">Index entries for sequences related to b.c.c. lattice</a>
%F Sum_{n>=1} a(n) * v^(2*n-1) = v*q/2 + (1-v^2) * f'(v) / f(v), where f(v) = Sum_{n>=0} A001406(n) * v^(2*n) and q = 8 is the number of nearest neighbors. - _Andrey Zabolotskiy_, Feb 14 2022
%Y Cf. A010571 (cubic), A047712 (f.c.c.), A001406 (partition function).
%K nonn,more
%O 1,1
%A _N. J. A. Sloane_
%E Name clarified and a(6)-a(8) added by _Andrey Zabolotskiy_, Feb 14 2022