A107868 - OEIS

%I #3 Mar 30 2012 18:36:46

%S 1,2,6,35,330,4368,74613,1560780,38608020,1101716330,35607051480,

%T 1285063345176,51209646652255,2232785266876080,105710363656182600,

%U 5399936810873056584,295998326072989842600,17328840976366636057110

%N Column 0 of triangle A107867; a(n) = C( n*(n-1)/2 + n + 1, n).

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

%Y Cf. A107867, A107869.

%K nonn

%O 0,2

%A _Paul D. Hanna_, Jun 04 2005