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Search: id:A051738
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| A051738 |
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Number of rooted 2-dimensional polyominoes with n pentagonal cells, with no symmetries removed. |
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+0
4
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| 1, 5, 30, 180, 1075, 6366, 37520, 220500, 1293615, 7581240, 44398387, 259881960, 1520633270, 8895116230
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Number of polypents (like polyominoes, with pentagons) with n cells. These are anchored polypents, with no culling for reflection or rotation (or translation) isomorphism.
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REFERENCES
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Dan Hoey, Bill Gosper and Rich Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.
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LINKS
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R. C. Schroeppel, A few mathematical experiments
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CROSSREFS
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A row of A094166.
Sequence in context: A156195 A105481 A094167 this_sequence A052934 A136785 A155195
Adjacent sequences: A051735 A051736 A051737 this_sequence A051739 A051740 A051741
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KEYWORD
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nonn
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AUTHOR
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Richard Schroeppel (rschroe(AT)sandia.gov), Feb 13 2002
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EXTENSIONS
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More terms from N. J. A. Sloane (njas(AT)research.att.com), May 06 2004
Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 15 2008 at the suggestion of R. J. Mathar
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