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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
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4, 60, 588, 4636, 31932, 200364, 1174492, 6538492, 34965772, 181084796, 913687100, 4511834156, 21880671292, 104497300828, 492527133804
(list; graph; refs; listen; history; internal format)
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OFFSET
| 6,1
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REFERENCES
| 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.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Sequence in context: A060492 A112041 A002060 * A034866 A055315 A013482
Adjacent sequences: A007217 A007218 A007219 * A007221 A007222 A007223
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KEYWORD
| nonn
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AUTHOR
| Simon Plouffe (simon.plouffe(AT)gmail.com)
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