A006726 Number of n-celled polygons with perimeter 2n on square lattice. (Formerly M4523)

1, 8, 40, 168, 676, 2672, 10376, 39824, 151878, 576656, 2181496, 8229160, 30974700, 116385088, 436678520, 1636472360, 6126647748

Offset

4,2

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=4..20.

I. G. Enting and A. J. Guttmann, On the area of square lattice polygons, J. Statist. Phys., 58 (1990), 475-484.

Crossrefs

Sequence in context: A364619 A217375 A113071 * A165665 A000760 A171189

Adjacent sequences: A006723 A006724 A006725 * A006727 A006728 A006729

Keyword

nonn

Author

N. J. A. Sloane, Simon Plouffe

Status

approved