A057413 Number of staircase polygons of perimeter 2n with any number of (staircase polygon) holes on square lattice (not allowing rotations).

1, 2, 5, 14, 42, 132, 430, 1442, 4956, 17400, 62251, 226506, 836911, 3136182, 11906908, 45761338, 177903128, 699167112, 2776219871, 11132523840, 45062497156, 184057276510, 758328417263, 3150593560374, 13195743501195

Offset

2,2

Links

I. Jensen, Table of n, a(n) for n = 2..51

I. Jensen, More terms

Crossrefs

Sequence in context: A120588 A168491 A000108 * A126567 A125501 A126569

Adjacent sequences: A057410 A057411 A057412 * A057414 A057415 A057416

Keyword

nonn

Author

N. J. A. Sloane, Aug 30 2000

Status

approved