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 A066070 #14 Jan 13 2022 13:18:25
%S A066070 1,6,3,10,5,14,7,18,9,22,11,26,13,30,15,34,17,38,19,42,21,46,23,50,25,
%T A066070 54,27,58,29,62,31,66,33,70,35,74,37,78,39,82,41,86,43,90,45,94,47,98,
%U A066070 49,102,51,106,53,110,55,114,57,118,59,122,61,126,63,130,65,134,67,138
%N A066070 a(1) = 1; for m > 0, a(2m) = 2(2m+1), a(2m+1) = 2m+1.
%H A066070 Harry J. Smith, <a href="/A066070/b066070.txt">Table of n, a(n) for n = 1..1000</a>
%H A066070 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,2,0,-1).
%F A066070 O.g.f.: (x+6x^2+x^3-2x^4)/(1-x^2)^2. - _Len Smiley_, Dec 05 2001
%t A066070 LinearRecurrence[{0,2,0,-1},{1,6,3,10},70] (* _Harvey P. Dale_, Jan 13 2022 *)
%o A066070 (PARI) { for (n=1, 1000, a=if (n%2, n, 2*n + 2); write("b066070.txt", n, " ", a) ) } \\ _Harry J. Smith_, Nov 09 2009
%Y A066070 Cf. A066069.
%K A066070 easy,nonn
%O A066070 1,2
%A A066070 _George E. Antoniou_, Dec 02 2001