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 A145273 #2 Oct 12 2013 15:24:51 %S A145273 1,0,1,0,0,1,1,0,0,0,0,1,1,0,1,0,0,0,1,1,1,0,0,1,1,0,1,0,0,0,1,1,0,0, %T A145273 0,1,0,0,0,1,0,0,0,1,0,1,1,0,1,1,0,1,0,0,0,1,0,0,0,1,1,1,1,0,0,1,1,1, %U A145273 0,0,1,1,0,0,1,1,1,0,1,0,1,1,0,0,0,0,0,0,0,0,0,1,0,1,0,1,0,1 %N A145273 Parity sequence of A006893. %C A145273 Complement of the parity sequence of iterated triangular numbers (A117872). %Y A145273 Cf. A145272. Complement of A117872 %K A145273 easy,nonn %O A145273 1,1 %A A145273 _Greg Huber_, Oct 06 2008