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A007222
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Almost-convex polygons of perimeter 2n on square lattice.
(Formerly M5203)
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0
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28, 1468, 34680, 535452, 6302296, 61400920, 520788460, 3976323744, 27974148068, 184411212644, 1153389882896, 6908837566500, 39921952365008
(list; graph; refs; listen; history; internal format)
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OFFSET
| 10,1
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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: A118705 A013926 A110696 * A042515 A042512 A163033
Adjacent sequences: A007219 A007220 A007221 * A007223 A007224 A007225
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KEYWORD
| nonn
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AUTHOR
| Simon Plouffe (simon.plouffe(AT)gmail.com)
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