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 A115083 #3 Mar 30 2012 18:36:55 %S A115083 1,3,7,31,150,853,5251,35109,249332,1873214,14754858,121380083, %T A115083 1037889452,9197178411,84207477581,794810896751,7717524260040, %U A115083 76956293344620,786822019659120,8237319107295510,88193381907972840 %N A115083 Column 2 of triangle A115080. %Y A115083 Cf. A115080, A115081 (column 0), A115082 (column 1), A115084 (row sums); A115088. %K A115083 nonn %O A115083 0,2 %A A115083 _Paul D. Hanna_, Jan 13 2006