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A005400 High temperature series for spin-1/2 Heisenberg specific heat on 2D hexagonal lattice.
(Formerly M4603)
2
0, 9, 18, -306, -3240, 49176, 1466640, -13626000, -1172668032, 75256704 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

REFERENCES

G. A. Baker et al., On the two-dimensional, spin-1/2 Heisenberg ferromagnetic models, Phys. Lett., 25A (1967), 207-209.

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

LINKS

Table of n, a(n) for n=1..10.

G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2

Index entries for sequences related to specific heat

CROSSREFS

Sequence in context: A050685 A278588 A133361 * A134115 A071587 A061750

Adjacent sequences:  A005397 A005398 A005399 * A005401 A005402 A005403

KEYWORD

sign

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Better description from Steven Finch

STATUS

approved

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Last modified June 21 10:09 EDT 2021. Contains 345360 sequences. (Running on oeis4.)