A056879 Number of n-celled axially symmetric polyominoes without holes.

0, 0, 0, 1, 2, 6, 9, 23, 37, 87, 138, 313, 510, 1130, 1859, 4070, 6786, 14750, 24811, 53715, 91096, 196769, 335815, 724470, 1243175, 2680212, 4619999, 9957652, 17231447, 37137177, 64480255, 138978282, 242011375, 521706359, 910817416, 1963885190, 3436463468, 7411495499, 12995261895, 28034824487

Offset

1,5

Links

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

Tomás Oliveira e Silva, Enumeration of polyominoes

Crossrefs

Cf. A000105, A000104, A006746.

Sequence in context: A127931 A346673 A077237 * A006746 A205875 A243558

Adjacent sequences: A056876 A056877 A056878 * A056880 A056881 A056882

Keyword

nonn

Author

N. J. A. Sloane, Sep 03 2000

Extensions

a(29)-a(40) from John Mason, Oct 11 2022

Status

approved