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A056880 Number of n-celled polyominoes without holes, symmetric about axis 2. 0
0, 1, 1, 1, 1, 2, 3, 4, 4, 6, 10, 11, 16, 18, 33, 34, 56, 56, 110, 106, 193, 177, 372, 335, 662, 571, 1269, 1084 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

Tomás Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Sequence in context: A290728 A296116 A017832 * A053273 A049988 A079247

Adjacent sequences:  A056877 A056878 A056879 * A056881 A056882 A056883

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 03 2000

STATUS

approved

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Last modified April 21 14:50 EDT 2021. Contains 343154 sequences. (Running on oeis4.)