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A005396 Number of 2n-step polygons on honeycomb.
(Formerly M4043)
0
0, 6, 0, 30, 24, 168, 288, 1170, 2760 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

REFERENCES

M. E. Fisher and M. F. Sykes, Excluded-volume problem and the Ising model of ferromagnetism, Phys. Rev. 114 (1959), 45-58.

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

CROSSREFS

Sequence in context: A062254 A028849 A138704 * A056462 A047762 A186977

Adjacent sequences:  A005393 A005394 A005395 * A005397 A005398 A005399

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 16 07:32 EST 2012. Contains 205874 sequences.