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A089456
Number of n-celled polyominoes with exactly 4 holes.
4
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 179, 2509, 25609, 214932, 1578984, 10536260, 65411645, 383981499, 2156114468
OFFSET
1,17
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Joseph Myers, Nov 04 2003
STATUS
approved