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

Author

N. J. A. Sloane, Sep 05 2000

Keywords

• nonn

Links

• Tomás Oliveira e Silva, Enumeration of polyominoes

Crossrefs

Cf. A006746, A057418.