A057410 Number of staircase polygons of perimeter 2n with one (staircase polygon) hole on square lattice (not allowing rotations).

1, 12, 94, 604, 3463, 18440, 93274, 454412, 2151673, 9964500, 45335002, 203303760, 900901387, 3952468348, 17194102478, 74257185512, 318693463933, 1360298775524, 5778468266446, 24442845038580

Offset

8,2

Links

I. Jensen, Table of n, a(n) for n = 8..103 (from link below)

I. Jensen, More terms

Crossrefs

Sequence in context: A173348 A294449 A073913 * A045894 A045829 A220683

Adjacent sequences: A057407 A057408 A057409 * A057411 A057412 A057413

Keyword

nonn

Author

N. J. A. Sloane, Aug 30 2000, corrected Aug 29 2006

Status

approved