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A057418
Number of n-celled polyominoes with 1 hole.
7
1, 6, 37, 195, 975, 4622, 21128, 94109, 410820, 1766591, 7506179, 31596240, 131991619, 547992183, 2263477612, 9309386178, 38150082057, 155859235424, 635067478628, 2581737704039
OFFSET
7,2
CROSSREFS
Sequence in context: A056338 A056328 A156185 * A001419 A081152 A244618
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 05 2000
STATUS
approved