A126469 - OEIS

%I #3 Mar 30 2012 18:37:02

%S 1,2,5,41,972,44457,3271312,352087787,52098230423,10141977387056,

%T 2513121624034518,772525844883337679,288558785171538716889,

%U 128760943237115947732171,67665205307818875323789155

%N Row sums of triangle A126465.

%o (PARI) {a(n)=local(M=matrix(n+1,n+1,r,c,if(r>=c,binomial((r-1)*r*(r+1)/3!-(c-1)*c*(c+1)/3!,r-c))), N=matrix(n+1,n+1,r,c,if(r>=c,binomial((r-1)*r*(r+1)/3!-(c-1)*c*(c+1)/3!+1,r-c)))); sum(k=0,n,(N*M^-1)[n+1,k+1])}

%Y Cf. A126465, A126466, A126467, A126468.

%K nonn

%O 0,2

%A _Paul D. Hanna_, Dec 27 2006