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 A027113 #6 Mar 30 2012 18:56:14 %S A027113 1,1,1,2,1,1,2,4,3,1,1,2,4,7,9,7,1,1,2,4,7,13,20,23,16,1,1,2,4,7,13, %T A027113 24,40,56,59,39,1,1,2,4,7,13,24,44,77,120,155,154,98,1,1,2,4,7,13,24, %U A027113 44,81,145,241,352,429,407,252,1,1,2,4,7,13,24 %N A027113 Triangular array T given by rows: T(n,0)=1 for n >= 0, T(n,1)=1,T(n,2)=2 for n >= 1 and for n >= 2, T(n,k)=T(n-1,k-3)+T(n-1,k-2)+T(n-1,k-1) for 3<=k<=2n-1, T(n,2n)=T(n-1,2n-3)+T(n-1,2n-2). %C A027113 The rows are of lengths 1, 3, 5, 7, ... %e A027113 1; 1,1,2; 1,1,2,4,3; 1,1,2,4,7,9,7; 1,1,2,4,7,13,20,23,16; ... %K A027113 nonn,tabf %O A027113 1,4 %A A027113 _Clark Kimberling_