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 A176636 #9 Jun 26 2025 12:41:54
%S A176636 57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,
%T A176636 71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,
%U A176636 57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57,71,57
%N A176636 Periodic sequence: Repeat [57, 71].
%C A176636 Continued fraction expansion of (4047+sqrt(16394397))/142.
%C A176636 Inverse binomial transform of 57 followed by 128*A000079.
%C A176636 Third inverse binomial transform of A176635.
%H A176636 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0, 1).
%F A176636 a(n) = 64-7*(-1)^n.
%F A176636 a(n) = -a(n-1)+128 for n > 0; a(0) = 57.
%F A176636 a(n) = a(n-2) for n > 1; a(0) = 57, a(1) = 71.
%F A176636 G.f.: (57+71*x)/((1-x)*(1+x)).
%t A176636 PadRight[{},100,{57,71}] (* _Harvey P. Dale_, Jun 18 2014 *)
%o A176636 (Magma) &cat[ [57, 71]: k in [1..35] ];
%Y A176636 Cf. A000079 (powers of 2), A176635, A176713 (decimal expansion of (4047+sqrt(16394397))/142).
%K A176636 easy,cofr,nonn
%O A176636 0,1
%A A176636 _Klaus Brockhaus_, Apr 22 2010
%E A176636 Comment, crossref and keyword cofr added by _Klaus Brockhaus_, Apr 24 2010