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A359522
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Number of free, holey, treelike polyominoes of n cells.
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1
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0, 0, 0, 0, 0, 0, 1, 5, 32, 144, 662, 2835, 11955, 49083, 199029, 796867, 3163384, 12463807
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OFFSET
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1,8
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LINKS
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EXAMPLE
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a(7) = 1 because of the holey heptomino.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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