%I M3519 #17 Feb 06 2022 06:53:47
%S 4,16,64,416,4544,23488,-207616,4205056,198295552,-2574439424,
%T -112886362112,3567419838464,94446596145152,-5636771173998592
%N Susceptibility for square lattice.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H G. A. Baker Jr., H. E. Gilbert, J. Eve, G. S. Rushbrooke, <a href="https://doi.org/10.1016/0375-9601(67)90860-2">On the two-dimensional, spin-1/2 Heisenberg ferromagnetic models</a>, Phys. Lett., 25A (1967), 207-209.
%H J. Oitmaa and E. Bornilla, <a href="https://doi.org/10.1103/PhysRevB.53.14228">High-temperature-series study of the spin-1/2 Heisenberg ferromagnet</a>, Phys. Rev. B, 53 (1996), 14228. See Table I and the note added in proof.
%Y Cf. A005399 (hexagonal), A002170 (cubic); A005402 (specific heat).
%K sign
%O 1,1
%A _N. J. A. Sloane_
%E Terms a(11)-a(14) added from Oitmaa and Bornilla by _Andrey Zabolotskiy_, Oct 20 2021 and Feb 05 2022