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 A073420 #5 Mar 30 2012 17:38:44 %S A073420 1,-1,-1,-1,0,-2,-4,-4,-8,-10,-17,-10,6,45,260,604,1285,3329,6755, %T A073420 12550,25790,46302,75922,129739,188164,215880,177637,-208052,-1480885, %U A073420 -4563499,-11984644,-28275270,-61059278,-126088969,-248020723,-462216478,-823834918,-1383451194,-2136524063 %N A073420 G.f.: 1/B(x) where B(x) = g.f. for A072964. %Y A073420 Cf. A072964. %K A073420 sign,easy %O A073420 0,6 %A A073420 _N. J. A. Sloane_, Aug 26 2002 %E A073420 More terms from _R. J. Mathar_, Feb 13 2008