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A201702
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Number of unlabeled 5-trees on n nodes.
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4
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0, 0, 0, 0, 1, 1, 1, 2, 5, 15, 64, 342, 2321, 18578, 168287, 1656209, 17288336, 188006362, 2105867058, 24108331027, 280638347609, 3310098377912, 39462525169310, 474697793413215, 5754095507495584, 70216415130786725, 861924378411516159, 10636562125193377459
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OFFSET
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1,8
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COMMENTS
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A k-tree is recursively defined as follows: K_k is a k-tree and any k-tree on n+1 vertices is obtained by joining a vertex to a k-clique in a k-tree on n vertices.
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REFERENCES
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Miklos Bona, editor, Handbook of Enumerative Combinatorics, CRC Press, 2015, page 328.
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LINKS
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Eric Weisstein's World of Mathematics, k-Tree
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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