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 A165766 #3 Jul 14 2012 11:32:31
%S A165766 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,
%T A165766 1,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1,0,1,0,0,0,
%U A165766 0,1,0,0,0,0,1,0,1,0,0,1,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,0,2,0,0,1,0,1,0
%N A165766 Number of tatami-free rooms of size 2n.
%C A165766 Number of pairs (r,c) such that r<=c, r*c=2n and A068920(r,c)=0.
%C A165766 A165632 lists twice the indices of nonzero terms, i.e. A165632 = { 2n | a(n)=0 }.
%K A165766 nonn
%O A165766 1,99
%A A165766 _M. F. Hasler_, Sep 26 2009