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 A101476 #2 Apr 30 2014 01:31:35 %S A101476 1,3,14,64,287,1265,5500,23660,100931,427669,1802170,7559473,31586889, %T A101476 131548937,546297862,2263042926,9354234285,38590884287,158932839678, %U A101476 653540335951,2683657672278,11006131763414,45086288225520 %N A101476 Sum[k=0..n, Sum[i>=0, C(2n,n-i(k+2))-C(2n,n+i(k+2)+k+1) ]]. %Y A101476 Row sums of triangle A101475. %K A101476 nonn %O A101476 0,2 %A A101476 _Ralf Stephan_, Jan 21 2005