

A005400


High temperature series for spin1/2 Heisenberg specific heat on 2D hexagonal lattice.
(Formerly M4603)


2



0, 9, 18, 306, 3240, 49176, 1466640, 13626000, 1172668032, 75256704, 1392243773184, 18426692664576, 2213592367094784
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OFFSET

1,2


COMMENTS

The hexagonal lattice is the familiar 2dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.


REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS



CROSSREFS



KEYWORD

sign,more


AUTHOR



EXTENSIONS

a(13) from Elstner et al. (see table I; signs differ because they consider antiferromagnet, and they mention energy instead of specific heat because the same coefficients are involved, cf. Eqs. (11) and (13) from Oitmaa & Bornilla) added by Andrey Zabolotskiy, Jun 17 2022


STATUS

approved



