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A006774
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Number of 2n-step polygons on honeycomb.
(Formerly M2257)
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1
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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; internal format)
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OFFSET
| 3,3
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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).
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LINKS
| I. Jensen, Table of n, a(n) for n = 3..79 (from link below)
I. Jensen, More terms
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CROSSREFS
| Sequence in context: A167639 A113205 A136657 * A086551 A007214 A189736
Adjacent sequences: A006771 A006772 A006773 * A006775 A006776 A006777
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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