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 A059272 #3 Mar 30 2012 16:48:58 %S A059272 0,1,2,9,47,272,1685,10939,73462,506111,3557109,25404296,183834627, %T A059272 1344987117,9932411282,73937697965,554234827675,4179895359240, %U A059272 31693701617841,241467983156655,1847602171074502,14191725625366331,109390959408760713 %N A059272 G.f. is g.f. for A059271 divided by g.f. for A059227. %Y A059272 Apart from leading terms, half of A059227. %K A059272 nonn %O A059272 0,3 %A A059272 _N. J. A. Sloane_, Jan 24 2001