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 A109680 #10 Feb 09 2023 01:58:16 %S A109680 1,2,3,4,1,6,7,8,5,10,11,12,9,14,15,16,13,18,19,20,17,22,23,24,21,26, %T A109680 27,28,25,30,31,32,29,34,35,36,33,38,39,40,37,42,43,44,41,46,47,48,45, %U A109680 50,51,52,49,54,55,56,53,58,59,60,57,62,63,64,61,2,67,68 %N A109680 a(n) = 2^(4n-2) - A104403(n). %H A109680 Amiram Eldar, <a href="/A109680/b109680.txt">Table of n, a(n) for n = 1..250</a> (calculated from the b-file at A102371) %Y A109680 Cf. A102371, A104403. %K A109680 nonn %O A109680 1,2 %A A109680 _Philippe Deléham_, Aug 06 2005 %E A109680 More terms from _Amiram Eldar_, Feb 09 2023