login
A056881
Number of n-celled diagonally symmetric polyominoes without holes.
3
0, 0, 1, 0, 2, 2, 6, 5, 21, 18, 70, 61, 239, 206, 828, 711, 2903, 2485, 10314, 8791, 37031, 31451, 134147, 113566, 489672, 413419, 1799084, 1515282, 6647009, 5586834, 24677902, 20703840, 92009606, 77067674, 344336294, 288001040, 1292929699, 1079999410, 4869184237, 4062534430
OFFSET
1,5
CROSSREFS
Cf. A000104, A006748 (with holes allowed).
Sequence in context: A360087 A306768 A174399 * A260322 A286540 A229980
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 03 2000
EXTENSIONS
a(29)-a(40) from John Mason, Oct 11 2022
STATUS
approved