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A113358 Column 2 of triangle A113355, also equals column 0 of A113355^3. 4

%I

%S 1,12,150,2184,37523,754171,17502145,462930509,13792292332,

%T 458112945183,16812390472566,676432435584855,29635374525536866,

%U 1405425902409792025,71770681806834337871,3928431507732054301085,229528875492540329214765

%N Column 2 of triangle A113355, also equals column 0 of A113355^3.

%C A113355 equals the matrix square of A113350, where column 2 of A113350^2 = column 0 of A113350^6.

%o (PARI) a(n)=local(A,B);A=matrix(1,1);A[1,1]=1;for(m=2,n+3,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); (matrix(#A,#A,r,c,if(r>=c,(A^(2*c))[r-c+1,1]))^2)[n+3,3]

%Y Cf. A113340, A113350, A113355, A113356 (column 0), A113357 (column 1), A113359 (column 3).

%K nonn

%O 0,2

%A _Paul D. Hanna_, Nov 08 2005

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Last modified February 4 14:43 EST 2023. Contains 360055 sequences. (Running on oeis4.)