A056882 Number of n-celled polyominoes without holes, symmetric about diagonal 2.

0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 2, 1, 2, 3, 4, 4, 6, 7, 12, 12, 17, 18, 33, 34, 51, 52, 93, 100, 154, 152, 276, 300, 474, 460, 846, 929, 1491, 1431, 2667, 2956

Offset

1,11

Links

Table of n, a(n) for n=1..40.

Tomás Oliveira e Silva, Enumeration of polyominoes

Crossrefs

Cf. A000104, A056878 (with holes allowed).

Sequence in context: A238219 A026833 A281544 * A035534 A241416 A082854

Adjacent sequences: A056879 A056880 A056881 * A056883 A056884 A056885

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 03 2000

Extensions

a(29)-a(40) from John Mason, Oct 10 2022

Status

approved