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 A059273 #3 Mar 30 2012 16:48:58 %S A059273 0,0,1,5,30,186,1197,7953,54233,377697,2676006,19230738,139850889, %T A059273 1027326257,7612046713,56825410753,426995181354,3227048864886, %U A059273 24513726327089,187067287095441,1433409279614225,11024386107439141,85075022074507194 %N A059273 Transform of A059226 applied to sequence 0, 0, 1, 0, 0, 0, 0, ... %Y A059273 A059227 is transform of 1, 0, 0, 0, ... %Y A059273 Cf. A059226, A059227, A059271, A059272. %K A059273 nonn %O A059273 0,4 %A A059273 _N. J. A. Sloane_, Jan 24 2001