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 A113344 #5 Jun 13 2017 22:50:30 %S A113344 1,9,117,1881,36051,805875,20661609,599319747,19443585048, %T A113344 698723462022,27583235473854,1187660855613822,55430739480692085, %U A113344 2789074498460404927,150571050665946174760,8684625004973955639293,533144024633105768180154 %N A113344 Column 4 of triangle A113340, also equals column 0 of A113340^9. %o A113344 (PARI) a(n)=local(A,B);A=matrix(1,1);A[1,1]=1;for(m=2,n+5,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[n+5,5] %Y A113344 Cf. A113341 (column 1), A113342 (column 2), A113343 (column 3), A113340. %K A113344 nonn %O A113344 0,2 %A A113344 _Paul D. Hanna_, Nov 08 2005