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A003104
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Number of hexagonal n-element polyominoes whose graph is a path.
(Formerly M1208)
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1
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1, 1, 2, 4, 10, 24, 67, 182, 520, 1474, 4248, 12196, 35168, 101226, 291565, 838764, 2412033, 6929754, 19896915
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| In other words, number of 2-sided strip polyhexes with n cells.
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REFERENCES
| E. M. Palmer, Variations of the cell growth problem, Lect. Notes Math. 303 (1972), 215-224.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polyhex
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CROSSREFS
| Sequence in context: A000084 A057734 A151516 * A121186 A028506 A148088
Adjacent sequences: A003101 A003102 A003103 * A003105 A003106 A003107
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KEYWORD
| nonn,more
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Terms 182,...,12196 from Ed Pegg, Jr., (ed(AT)mathpuzzle.com), May 13 2009
a(13)-a(19) from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 26 2010
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