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A057410 Number of staircase polygons of perimeter 2n with one (staircase polygon) hole on square lattice (not allowing rotations). 4
1, 12, 94, 604, 3463, 18440, 93274, 454412, 2151673, 9964500, 45335002, 203303760, 900901387, 3952468348, 17194102478, 74257185512, 318693463933, 1360298775524, 5778468266446, 24442845038580 (list; graph; refs; listen; history; text; internal format)
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: A044644 A173348 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

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Last modified November 18 05:08 EST 2017. Contains 294853 sequences.