id:A045739 - OEIS Search Results

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Number of edges in all noncrossing forests on n nodes on a circle.

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1, 9, 70, 535, 4101, 31633, 245512, 1915875, 15020545, 118231212, 933812892, 7397179309, 58746824150, 467602683135, 3729318261224, 29795160492299, 238421091129957, 1910544426355420, 15329353155160880, 123138401704273620 (list; graph; listen)

	OFFSET	`2,2`
	FORMULA	`sum(kbinomial(n, k+1)binomial(n+2*k-1, k)/(n+k), k=1..n-1)`
	CROSSREFS	`Sequence in context: A167534 A110202 A110201 this_sequence A098205 A000899 A156705` `Adjacent sequences: A045736 A045737 A045738 this_sequence A045740 A045741 A045742`
	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.

AT&T Labs Research