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 A079355 #10 Aug 07 2019 05:32:10 %S A079355 1,5,9,13,10,14,18,22,19,16,20,24,21,18,22,19,23,20,17,14,11,8,5,2,6, %T A079355 10,14,18,22,26,30,34,38,35,32,36,40,37,41,38,35,39,43,47,51,55,52,56, %U A079355 60,64,61,58,62,66,63,60,64,61,65,62,59,56,53,50,47,44,48,52,56,60,64,68 %N A079355 a(1) = 1; a(n) = a(n-1)-3 if n is already in the sequence, a(n) = a(n-1)+4 otherwise. %F A079355 a(n) = n+b(n)-22 where b(n) is the 42-periodic sequence (22, 25, 28, 31, 27, 30, 33, 36, 32, 28, 31, 34, 30, 26, 29, 25, 28, 24, 20, 16, 12, 8, 4, 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 23, 19, 22, 25, 21, 24, 20, 16, 19) %Y A079355 Cf. A079357. %K A079355 nonn,hear %O A079355 1,2 %A A079355 _Benoit Cloitre_, Feb 14 2003