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 A112694 #3 Oct 12 2012 14:40:24 %S A112694 1,10,362,146450,234522884,6807857991672,869962821793011472, %T A112694 2352463379908322901560928,36305094521738344415450726082096, %U A112694 13237525270352155405709985211985066209696 %N A112694 Row sums of unsigned array A112692. %F A112694 a(n)=sum(|A112692(k, m)|, m=0..((k+1)*(k+2)/2)-1), k>=0. %Y A112694 Signed row sums A112693. %K A112694 nonn,easy %O A112694 0,2 %A A112694 _Wolfdieter Lang_, Oct 14 2005