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 A087702 #4 Dec 05 2013 19:56:32 %S A087702 1,990,10,0,0,0,0,120,0,0,0,0,0,0,0,0,0,0,0,1540,0,0,0,0,0,0,0,0,0,0, %T A087702 0,0,0,7140,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A087702 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A087702 Triangular numbers arising in A088126. %Y A087702 Cf. A088126. %K A087702 nonn %O A087702 1,2 %A A087702 _Amarnath Murthy_, Sep 26 2003 %E A087702 More terms from _David Wasserman_, Jun 16 2005