A057420 Axially symmetric n-celled polyominoes with 1 hole.

1, 3, 8, 25, 45, 137, 221, 650, 1006, 2857, 4370, 12050, 18417, 49516, 76037, 200184, 309411, 800440, 1245934, 3176482

Offset

9,2

Links

Table of n, a(n) for n=9..28.

Tomás Oliveira e Silva, Enumeration of polyominoes

Crossrefs

Cf. A006746, A057418.

Sequence in context: A328272 A220486 A180380 * A076049 A026970 A026980

Adjacent sequences: A057417 A057418 A057419 * A057421 A057422 A057423

Keyword

nonn

Author

N. J. A. Sloane, Sep 05 2000

Status

approved