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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
OFFSET
1,11
CROSSREFS
Cf. A000104, A056878 (with holes allowed).
Sequence in context: A238219 A026833 A281544 * A035534 A241416 A082854
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 03 2000
EXTENSIONS
a(29)-a(40) from John Mason, Oct 10 2022
STATUS
approved