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A057414 Number of staircase polygons of area n with one (staircase polygon) hole on square lattice (not allowing rotations). 2
1, 4, 18, 62, 205, 624, 1841, 5214, 14448, 39118, 104281, 273900, 711416, 1828950, 4663203, 11801056, 29677044, 74209404, 184655403, 457446252, 1128794669, 2775534900, 6802886782, 16625602146, 40524317635 (list; graph; refs; listen; history; text; internal format)
OFFSET

8,2

LINKS

I. Jensen, Table of n, a(n) for n = 8..113 (from link below)

I. Jensen, More terms

CROSSREFS

Sequence in context: A192069 A073373 A227162 * A165910 A212766 A100177

Adjacent sequences:  A057411 A057412 A057413 * A057415 A057416 A057417

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 30 2000

STATUS

approved

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Last modified May 29 10:48 EDT 2017. Contains 287246 sequences.