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 A083797 #6 Aug 21 2014 14:37:12 %S A083797 1,1,3,6,14,30,39,28,804,1620,2465,15048,27642,138502,360255,360120, %T A083797 720584,8648478,12252069,208287880,232792350,232792098,232792307, %U A083797 2327925312,5354228580,16062686250,26771144049,26771143896,80313432794 %N A083797 Diagonal of A083796. %Y A083797 Cf. A083796, A083798, A083799. %Y A083797 Cf. A101085. %K A083797 nonn %O A083797 1,3 %A A083797 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 08 2003 %E A083797 More terms from _David Wasserman_, Nov 30 2004