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A350030
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a(n) is the number of n-celled unholey treelike polyominoes.
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1
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1, 1, 2, 4, 11, 27, 82, 250, 815, 2685, 9072, 30889, 106290, 367733, 1279573, 4470304, 15676760, 55147665
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OFFSET
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1,3
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LINKS
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FORMULA
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CROSSREFS
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Cf. A308300 (number of simply connected square animals with n cells and k internal vertices, triangle read by rows).
Cf. A131482 (polyominoes with perimeter 2n+2, i.e., treelike).
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KEYWORD
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nonn,hard,more
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AUTHOR
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STATUS
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approved
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