A126447 Column 1 of triangle A126445; a(n) = C( C(n+3,3) - 1, n).

1, 3, 36, 969, 46376, 3478761, 377447148, 56017460733, 10912535409348, 2703343379981793, 830496702831140346, 310006778438284515093, 138247735223480364826280, 72613463426660610635960445

Offset: 0

Author

Paul D. Hanna, Dec 27 2006

Keywords

• nonn

Crossrefs

Cf. A126445; A126446, A126448, A126449; A126452, A126456, A126459.

Programs

Mathematica

Table[Binomial[Binomial[n+3,3]-1,n],{n,0,20}] (* Harvey P. Dale, Apr 22 2022 *)

PARI

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