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Search: id:A072247
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| A072247 |
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Triangle T(n,k) (n>=2, 2<=k<=n-1 if n>2) giving number of non-crossing trees with n nodes and k endpoints. |
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3
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| 1, 3, 8, 4, 20, 30, 5, 48, 144, 75, 6, 112, 560, 595, 154, 7, 256, 1920, 3440, 1848, 280, 8, 576, 6048, 16380, 14994, 4788, 468, 9
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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For n>2 n-th row has n-2 terms.
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REFERENCES
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E. Deutsch and M. Noy, Statistics on non-crossing trees, Discr. Math., 254 (2002), 75-87.
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EXAMPLE
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1; 3; 8,4; 20,30,5; 48,144,75,6; ...
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CROSSREFS
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First column gives A001792, row sums are A001764.
Sequence in context: A021030 A010628 A106292 this_sequence A051359 A016670 A021726
Adjacent sequences: A072244 A072245 A072246 this_sequence A072248 A072249 A072250
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KEYWORD
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nonn,tabf
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AUTHOR
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njas, Jul 06 2002
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