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A056882
Number of n-celled polyominoes without holes, symmetric about diagonal 2.
3
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
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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
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Last modified April 25 11:39 EDT 2024. Contains 371969 sequences. (Running on oeis4.)