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 A096883 #6 Jun 13 2015 00:51:23
%S A096883 1,10,101,1010,10201,102010,1030301,10303010,104060401,1040604010,
%T A096883 10510100501,105101005010,1061520150601,10615201506010,
%U A096883 107213535210701,1072135352107010,10828567056280801,108285670562808010
%N A096883 Expansion of (1+10x)/(1-101x^2).
%H A096883 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,101).
%F A096883 a(n)=9a(n-1)+10a(n-2)+101^floor((n-2)/2); a(n)=sum{k=0..floor(n/2), binomial(floor(n/2), k)10^(n-2k) }.
%Y A096883 Cf. A004663, A026383, A016116, A096881, A096882.
%K A096883 easy,nonn
%O A096883 0,2
%A A096883 _Paul Barry_, Jul 14 2004