This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A113379 #5 Jun 13 2017 23:23:09 %S A113379 1,3,15,136,1998,41973,1166263,40747561,1726907675,86421647389, %T A113379 5002021986418,329382745551946,24351172588548270,1999205882982496161, %U A113379 180613538916429940159,17817366508243503227269 %N A113379 Column 0 of triangle A113378, also equals column 0 of A113389. %F A113379 A113378 equals the matrix cube of A113370, which has the property: column k of A113370^3 = column 0 of A113389^(3*k+1) for k>=0. %o A113379 (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^3)[n+1,1] %Y A113379 Cf. A113378, A113370, A113389, A113380 (column 1). %K A113379 nonn %O A113379 0,2 %A A113379 _Paul D. Hanna_, Nov 14 2005