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A005397 Number of n-step polygons on Kagome lattice.
(Formerly M3186)
0
4, 0, 0, 4, 28, 80, 120, 120, 264, 1080, 3120, 6440, 11960, 26688, 70448, 179340, 415796, 935560, 2195536, 5374468 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

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).

LINKS

Table of n, a(n) for n=3..22.

CROSSREFS

Cf. A001665.

Sequence in context: A096406 A189885 A151673 * A259124 A273515 A021718

Adjacent sequences:  A005394 A005395 A005396 * A005398 A005399 A005400

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(14)-a(22) from Sean A. Irvine, Jun 12 2016

STATUS

approved

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Last modified February 18 17:08 EST 2018. Contains 299325 sequences. (Running on oeis4.)