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%I #5 Jun 13 2017 22:51:33
%S 1,4,22,166,1671,21510,341463,6496923,144856710,3716746006,
%T 108133664181,3523951953981,127331488458476,5057405619797317,
%U 219179491109978660,10298771194610350427,521765883689616772731,28363341834962918344084
%N Column 1 of triangle A113350, also equals column 0 of A113340^4.
%o (PARI) a(n)=local(A,B);A=matrix(1,1);A[1,1]=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^(2*j-1))[i-j+1,1]));));A=B);(A^4)[n+1,1]
%Y Cf. A113340, A113350, A113346 (column 0), A113352 (column 2), A113353 (column 3), A113354 (column 4).
%K nonn
%O 0,2
%A _Paul D. Hanna_, Nov 08 2005