A126456 - OEIS

%I #5 Feb 03 2015 19:54:40

%S 1,5,55,1330,58905,4187106,437353560,63140314380,12049276177620,

%T 2938311614386005,891655291709643461,329600203128234828790,

%U 145830232567505064233200,76102715775896720790887700

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

%t Table[Binomial[Binomial[n+3,3]+1,n],{n,0,20}] (* _Harvey P. Dale_, Feb 03 2015 *)

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

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

%K nonn

%O 0,2

%A _Paul D. Hanna_, Dec 27 2006