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A056882 Number of n-celled polyominoes without holes, symmetric about diagonal 2. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

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

Tomás Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Sequence in context: A238219 A026833 A281544 * A035534 A241416 A082854

Adjacent sequences:  A056879 A056880 A056881 * A056883 A056884 A056885

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 03 2000

STATUS

approved

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Last modified August 22 00:43 EDT 2019. Contains 326169 sequences. (Running on oeis4.)