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 A164683 #12 Jun 30 2023 01:09:07
%S A164683 1,8,8,64,64,512,512,4096,4096,32768,32768,262144,262144,2097152,
%T A164683 2097152,16777216,16777216,134217728,134217728,1073741824,1073741824,
%U A164683 8589934592,8589934592,68719476736,68719476736,549755813888
%N A164683 a(n) = 8*a(n-2) for n > 2; a(1) = 1, a(2) = 8.
%C A164683 Interleaving of A001018 and A001018 without initial term 1.
%C A164683 Binomial transform is A083100. Second binomial transform is A164607.
%H A164683 Vincenzo Librandi, <a href="/A164683/b164683.txt">Table of n, a(n) for n = 1..300</a>
%H A164683 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0, 8).
%F A164683 a(n) = 2^(1/4*(6*n-3+3*(-1)^n)).
%F A164683 G.f.: x*(1+8*x)/(1-8*x^2).
%t A164683 With[{c=8^Range[0,15]},Riffle[c,c]]//Rest (* _Harvey P. Dale_, Aug 08 2017 *)
%o A164683 (Magma) [ n le 2 select 7*n-6 else 8*Self(n-2): n in [1..26] ];
%Y A164683 Cf. A001018 (powers of 8), A083100, A164607.
%K A164683 nonn,easy
%O A164683 1,2
%A A164683 _Klaus Brockhaus_, Aug 22 2009