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 A113363 #5 Jun 13 2017 23:05:03 %S A113363 1,21,399,8127,184436,4695719,133730310,4234560596,148077895854, %T A113363 5680484146379,237574859841676,10771591113205720,526750324271281348, %U A113363 27655229128194306702,1552379671658643163707,92820542631741826797326 %N A113363 Column 3 of triangle A113360, also equals column 1 of A113340^7. %C A113363 A113360 equals the matrix cube of triangle A113340, where column 3 of A113340^3 = column 1 of A113340^7. %o A113363 (PARI) a(n)=local(A,B);A=matrix(1,1);A[1,1]=1;for(m=2,n+4,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^3)[n+4,4] %Y A113363 Cf. A113340, A113350, A113360 (A113340^3), A113341 (column 0), A113361 (column 1), A113362 (column 2), A113364 (column 4). %K A113363 nonn %O A113363 0,2 %A A113363 _Paul D. Hanna_, Nov 08 2005