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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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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 (plouffe(AT)math.uqam.ca)
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