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A005399 E.g.f.: high-temperature series in J/2kT for ferromagnetic susceptibility for the spin-1/2 Heisenberg model on hexagonal lattice.
(Formerly M4256)
1
6, 48, 408, 3600, 42336, 781728, 13646016, 90893568, -1798204416 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Previous name was: Susceptibility series for hexagonal lattice.

The hexagonal lattice is the familiar 2-dimensional 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

Table of n, a(n) for n=1..9.

G. A. Baker Jr., H. E. Gilbert, J. Eve, G. S. Rushbrooke, On the two-dimensional, spin-1/2 Heisenberg ferromagnetic models, Phys. Lett., 25A (1967), 207-209.

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

CROSSREFS

Cf. A002920, A047709, A005400, A005401, A005402.

Sequence in context: A264083 A083233 A002918 * A258790 A244038 A037184

Adjacent sequences:  A005396 A005397 A005398 * A005400 A005401 A005402

KEYWORD

sign,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

New name from Andrey Zabolotskiy, Mar 03 2021

STATUS

approved

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Last modified May 8 15:54 EDT 2021. Contains 343666 sequences. (Running on oeis4.)