A113091 - OEIS

%I #7 Jun 20 2022 04:14:31

%S 1,12,255,11326,1136709,272246616,162043308555,246976754748242,

%T 985451332639242321,10465989453804481920460,

%U 299684548041297413533699479,23373481327888949572209959486022,5007060652963472122780384849366677469

%N Column 1 of triangle A113090.

%o (PARI) {a(n)=local(M=matrix(n+1,n+1));for(r=1,n+1, for(c=1,r, M[r,c]=if(r==c,1,if(c>1,(M^3)[r-1,c-1])+(M^3)[r-1,c]))); return(if(n<1,0,(M^3)[n+1,2]))}

%Y Cf. A113090.

%K nonn

%O 1,2

%A _Paul D. Hanna_, Oct 14 2005