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 A152799 #2 Mar 30 2012 18:37:15 %S A152799 1,1,3,6,15,40,113,348,1148,4045,15203,60710,256688,1145887,5386283, %T A152799 26590338,137537012,743766652,4196681423,24661702224,150676068558, %U A152799 955611495432,6281965526173,42745748797360,300690981532778 %N A152799 Column 2 of triangle A152798; first differences of A122889. %Y A152799 Cf. A152798, A122889. %K A152799 nonn %O A152799 0,3 %A A152799 _Paul D. Hanna_, Dec 23 2008