A370954 Denominators of coefficients of the partition function per spin, lambda (divided by 2), in the very high temperature region, expressed as a power series in the parameter K^2, for the spin-1/2 Ising model on square lattice.

1, 1, 3, 45, 315, 14175, 66825, 42567525, 58046625, 1993723875, 9280784638125, 2143861251406875, 21132346621010625, 4370553505709015625, 9086380738369043484375, 564653660170076273671875

Offset

0,3

Links

Table of n, a(n) for n=0..15.

Hendrik A. Kramers and Gregory H. Wannier. Statistics of the two-dimensional ferromagnet. Part I. Phys. Rev. 60 (1941), 252-262.

Hendrik A. Kramers and Gregory H. Wannier. Statistics of the two-dimensional ferromagnet. Part II. Phys. Rev. 60 (1941), 263-276. See (41), p. 263.

Hendrik A. Kramers and Gregory H. Wannier, Extract from page 263 of Part II.

Wikipedia, Square lattice Ising model.

Crossrefs

See A370953 for numerators.

Cf. A370955, A002908.

Sequence in context: A359860 A002682 A073595 * A117972 A061532 A309453

Adjacent sequences: A370951 A370952 A370953 * A370955 A370956 A370957

Keyword

nonn,frac

Author

N. J. A. Sloane, Mar 10 2024

Extensions

Terms a(5) and beyond from Andrey Zabolotskiy, Mar 10 2024

Status

approved