A126456 Column 1 of triangle A126454; a(n) = C( C(n+3,3) + 1, n).

1, 5, 55, 1330, 58905, 4187106, 437353560, 63140314380, 12049276177620, 2938311614386005, 891655291709643461, 329600203128234828790, 145830232567505064233200, 76102715775896720790887700

Offset: 0

Author

Paul D. Hanna, Dec 27 2006

Keywords

• nonn

Crossrefs

Cf. A126454, A126455; A126447, A126452, A126459.

Programs

Mathematica

Table[Binomial[Binomial[n+3,3]+1,n],{n,0,20}] (* Harvey P. Dale, Feb 03 2015 *)

PARI

a(n)=binomial((n+1)*(n+2)*(n+3)/3!+1, n)