A108288 Main diagonal of table A060543; a(n) = C((n+1)^2-1, n*(n+1)).

1, 3, 28, 455, 10626, 324632, 12271512, 553270671, 28987537150, 1731030945644, 116068178638776, 8634941152058949, 705873715441872264, 62895036884524942320, 6067037854078498539696, 629921975126394617164575, 70043473196734767582082230

Offset: 0

Author

Paul D. Hanna, May 31 2005

Keywords

• nonn

Crossrefs

Cf. A060545, A108267, A060543, A108289.

Programs

PARI

a(n)=binomial((n+1)^2-1,n*(n+1))

Formula

a(n) = A060545(n+1). - R. J. Mathar, Aug 24 2008