|
%I #5 Jun 13 2017 23:23:03
%S 1,5,45,635,12815,343815,11651427,480718723,23489845779,1330745268401,
%T 85944092769721,6242138253088466,504185328302302736,
%U 44867722807185829082,4364538423763543903228,460969199012824227856506
%N Column 1 of triangle A113381, also equals column 0 of A113370^5.
%F Column k of A113381 = column 0 of A113370^(3*k+2) for k>=0.
%o (PARI) a(n)=local(A,B);A=Mat(1);for(m=2,n+1,B=matrix(m,m); for(i=1,m, for(j=1,i,if(i<3 || j==i || j>m-1,B[i,j]=1,if(j==1, B[i,1]=1,B[i,j]=(A^(3*j-2))[i-j+1,1]));));A=B);(A^5)[n+1,1]
%Y Cf. A113381, A113375 (column 0), A113383 (column 2), A113370.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Nov 14 2005
|
