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Search: id:A007220
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| A007220 |
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Almost-convex polygons of perimeter 2n on square lattice.
(Formerly M3692)
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+0
1
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| 4, 60, 588, 4636, 31932, 200364, 1174492, 6538492, 34965772, 181084796, 913687100, 4511834156, 21880671292, 104497300828, 492527133804
(list; graph; listen)
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OFFSET
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6,1
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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).
I. G. Enting, A. J. Guttmann, L. B. Richmond and N. C. Wormald, Enumeration of almost-convex polygons on the square lattice, Random Structures Algorithms 3 (1992), 445-461.
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CROSSREFS
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Sequence in context: A060492 A112041 A002060 this_sequence A034866 A055315 A013482
Adjacent sequences: A007217 A007218 A007219 this_sequence A007221 A007222 A007223
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KEYWORD
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nonn
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AUTHOR
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Simon Plouffe (simon.plouffe(AT)gmail.com)
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