A113332 a(n) = A113129(2*n+2,n+2) for n>=0.

2, 10, 84, 930, 12452, 193284, 3393480, 66310914, 1425717060, 33435425100, 849342514200, 23235509430900, 681196753501992, 21309727555222600, 708630046700665104, 24964702239372310338, 928914855447585334020

Offset: 0

Author

Philippe Deléham and Paul D. Hanna, Nov 03 2005

Keywords

• nonn

Comments

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

Crossrefs

Cf. A113129, A000699.

Formula

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