A057414 Number of staircase polygons of area n with one (staircase polygon) hole on square lattice (not allowing rotations).

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

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: A073373 A292465 A227162 * A165910 A212766 A100177

Adjacent sequences: A057411 A057412 A057413 * A057415 A057416 A057417

Keyword

nonn

Author

N. J. A. Sloane, Aug 30 2000

Status

approved