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 A196664 #29 Mar 18 2025 13:46:56
%S A196664 1,11,176,2816,45056,720896,11534336,184549376,2952790016,47244640256,
%T A196664 755914244096,12094627905536,193514046488576,3096224743817216,
%U A196664 49539595901075456,792633534417207296,12682136550675316736,202914184810805067776,3246626956972881084416
%N A196664 Expansion of g.f. (1-5*x)/(1-16*x).
%H A196664 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (16).
%F A196664 a(0) = 1, a(n) = 11*16^(n-1) for n>0.
%F A196664 a(n) = Sum_{k=0..n} A193722(n,k)*5^k.
%F A196664 From _Elmo R. Oliveira_, Mar 18 2025: (Start)
%F A196664 E.g.f.: (11*exp(16*x) + 5)/16.
%F A196664 a(n) = 16*a(n-1). (End)
%t A196664 Join[{1},Table[11 16^(n-1),{n,20}]] (* _Harvey P. Dale_, Oct 20 2011 *)
%Y A196664 Cf. A001025, A193722, A196661, A196662, A196663.
%K A196664 nonn,easy
%O A196664 0,2
%A A196664 _Philippe Deléham_, Oct 05 2011