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 A047867 #7 Mar 30 2012 18:38:43 %S A047867 1,8,58,444,3708,33976,341064 %N A047867 Erroneous version of A002538. %C A047867 More generally the main diagonal of the array defined by T(0,j)=j+1 j>=0, T(i,0)=i+1 i>=0, T(i,j)=T(i-1,j-1)+T(i-1,j)+ A, is given by T(n,n)=2^(n-1)*(n+2A+2)-A - _Benoit Cloitre_, Jun 17 2003 %F A047867 Main diagonal of the array defined by T(0, j)=j+1 j>=0, T(i, 0)=i+1 i>=0, T(i, j)=T(i-1, j-1)+T(i-1, j)+ 5; a(n)=2^(n-1)*(n+12)-5 - _Benoit Cloitre_, Jun 17 2003 %K A047867 dead %O A047867 1,2