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A056634 Number of polygons of length 2n with one hole on square lattice (not allowing rotations). 3
1, 24, 342, 3804, 36802, 326540, 2735308, 22006264, 171912401, 1313614776, 9868281330, 73150450248, 536495354621, 3900954906412, 28164962681150, 202166363020920, 1444068530799525, 10272599729628876 (list; graph; refs; listen; history; text; internal format)
OFFSET

8,2

LINKS

I. Jensen, Table of n, a(n) for n = 8..41 (from link below)

I. Jensen, More terms

CROSSREFS

Cf. A002931.

Sequence in context: A264454 A077527 A083766 * A022748 A288968 A269029

Adjacent sequences:  A056631 A056632 A056633 * A056635 A056636 A056637

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 30 2000

STATUS

approved

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Last modified April 8 05:55 EDT 2020. Contains 333312 sequences. (Running on oeis4.)