A005400 - OEIS

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A005400

High temperature series for spin-1/2 Heisenberg specific heat on 2D hexagonal lattice.
(Formerly M4603)

0, 9, 18, -306, -3240, 49176, 1466640, -13626000, -1172668032, 75256704 (list; graph; refs; listen; history; 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	`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: A002169 A050685 A133361 * A071587 A134115 A061750` `Adjacent sequences: A005397 A005398 A005399 * A005401 A005402 A005403`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`Better description from S. R. Finch (Steven.Finch(AT)inria.fr)`

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.