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 A099101 #8 Jun 13 2015 00:51:32
%S A099101 1,0,3,5,16,43,113,316,839,2301,6204,16855,45665,123800,335659,909845,
%T A099101 2466760,6686979,18128529,49145300,133231279,361184653,979156724,
%U A099101 2654456239,7196122817,19508406192,52886508243,143373224101
%N A099101 Quintisection of 1/(1-x^3-x^4).
%H A099101 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,5,6,1).
%F A099101 a(n)=sum{k=0..floor(5n/3), binomial(k, 5n-3k)}.
%F A099101 a(n)=A017817(5n).
%F A099101 G.f.: (1+x)*(x^2+x-1) / ( -1+5*x^2+6*x^3+x^4 ). - _R. J. Mathar_, Feb 19 2015
%Y A099101 Cf. A099099.
%K A099101 easy,nonn,less
%O A099101 0,3
%A A099101 _Paul Barry_, Sep 29 2004