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A056879 Number of n-celled axially symmetric polyominoes without holes. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..28.

Tomás Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Cf. A000105, A006746.

Sequence in context: A048083 A127931 A077237 * A006746 A205875 A243558

Adjacent sequences:  A056876 A056877 A056878 * A056880 A056881 A056882

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 03 2000

STATUS

approved

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Last modified April 22 19:11 EDT 2021. Contains 343177 sequences. (Running on oeis4.)