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Search: id:A045737
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A045737 Number of nonroot branch nodes in all noncrossing rooted trees on n nodes on a circle. +0
2
0, 0, 3, 28, 210, 1470, 9996, 67032, 446292, 2960100, 19594575, 129585456, 856703848, 5663913528, 37454912040, 247778648880, 1639890119016, 10858731869160, 71939098633185, 476841658085100, 3162310375905450 (list; graph; listen)
OFFSET

2,3
LINKS

Index entries for sequences related to rooted trees

FORMULA

7(n-1)*binomial(3n-6, n-4)/(2n-1)

CROSSREFS

Sequence in context: A074922 A081019 A091120 this_sequence A003466 A092637 A094296

Adjacent sequences: A045734 A045735 A045736 this_sequence A045738 A045739 A045740

KEYWORD

nonn

AUTHOR

Emeric Deutsch (deutsch(AT)duke.poly.edu)

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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