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Search: id:A006535
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| A006535 |
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Number of one-sided hexagonal polyominoes with n cells.
(Formerly M2846)
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+0
3
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| 1, 1, 3, 10, 33, 147, 620, 2821, 12942, 60639, 286190, 1364621, 6545430, 31586358, 153143956, 745700845, 3644379397, 17869651166, 87877879487, 433301253231
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
J. Meeus, personal communication.
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LINKS
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Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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CROSSREFS
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A006535 = 2*A000228 - A030225.
Sequence in context: A149030 A149031 A145928 this_sequence A041633 A034215 A083580
Adjacent sequences: A006532 A006533 A006534 this_sequence A006536 A006537 A006538
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KEYWORD
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hard,nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from David W. Wilson (davidwwilson(AT)comcast.net). a(13) from Achim Flammenkamp (achim(AT)uni-bielefeld.de) Feb 15 1999.
More terms from Joseph Myers (jsm(AT)polyomino.org.uk), Sep 21 2002
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