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A113332 a(n) = A113129(2*n+2,n+2) for n>=0. 1
2, 10, 84, 930, 12452, 193284, 3393480, 66310914, 1425717060, 33435425100, 849342514200, 23235509430900, 681196753501992, 21309727555222600, 708630046700665104, 24964702239372310338, 928914855447585334020 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

COMMENTS

Related to A000699, the number of irreducible diagrams with 2n nodes.

FORMULA

a(n) = A000699(n+1)*(2*n+3)*(n+2)/(3*(n+1)).

CROSSREFS

Cf. A113129, A000699.

Sequence in context: A121516 A024491 A147316 * A180715 A107863 A065866

Adjacent sequences:  A113329 A113330 A113331 * A113333 A113334 A113335

KEYWORD

nonn

AUTHOR

Philippe DELEHAM (kolotoko(AT)wanadoo.fr) and Paul D. Hanna (pauldhanna(AT)juno.com), Nov 03 2005

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Last modified February 15 14:57 EST 2012. Contains 205823 sequences.