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Search: id:A007222
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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
1
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| 28, 1468, 34680, 535452, 6302296, 61400920, 520788460, 3976323744, 27974148068, 184411212644, 1153389882896, 6908837566500, 39921952365008
(list; graph; listen)
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OFFSET
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10,1
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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: A118705 A013926 A110696 this_sequence A042515 A042512 A163033
Adjacent sequences: A007219 A007220 A007221 this_sequence A007223 A007224 A007225
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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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