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 A136741 #3 Mar 30 2012 18:37:09 %S A136741 1,3,22,250,3810,72492,1649634,43626510,1313526375,44332221175, %T A136741 1657043432088,67929461003560,3029864359322346,146058681728370600, %U A136741 7566706624571096610,419220650458638848514,24733868801871384287055 %N A136741 Diagonal of square array A136737, one place above the main diagonal. %Y A136741 Cf. A136737; A121413, A121417, A121422; A121427. %K A136741 nonn %O A136741 0,2 %A A136741 _Paul D. Hanna_, Jan 19 2008