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A006774 Number of 2n-step polygons on honeycomb.
(Formerly M2257)
1
1, 0, 3, 2, 12, 18, 65, 138, 432, 1074, 3231, 8718, 25999, 73650, 220215, 643546, 1937877, 5783700, 17564727, 53222094, 163009086, 499634508, 1542392088, 4770925446, 14832934031, 46227584010, 144632622552, 453628244950 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,3

REFERENCES

I. G. Enting and A. J. Guttmann, Polygons on the honeycomb lattice, J. Phys. A 22 (1989), 1371-1384.

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

LINKS

I. Jensen, Table of n, a(n) for n = 3..79 (from link below)

I. Jensen, More terms

CROSSREFS

Sequence in context: A167639 A113205 A136657 * A086551 A254215 A007214

Adjacent sequences:  A006771 A006772 A006773 * A006775 A006776 A006777

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified September 19 23:31 EDT 2019. Contains 327207 sequences. (Running on oeis4.)