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 A163469 #7 Sep 22 2017 07:40:13 %S A163469 1,1,1,1,3,3,3,3,3,9,15,11,11,3,3,5,9,63,3,15,5,11,15,31,1,3,21,13,9, %T A163469 9,31,39,15,7,25,21,35,11,9,39,53,53,81,21,5,23,9,39,17,21,19,3,77,5, %U A163469 39,57,41,29,45,21,11,15,13,39,17,33,67,129,33,13,3,5,105,67,7,13,3,15,63 %N A163469 a(n) = A055496(n+1) - 2*A055496(n). %H A163469 Michel Marcus, <a href="/A163469/b163469.txt">Table of n, a(n) for n = 1..999</a> %Y A163469 Cf. A055496. %K A163469 nonn %O A163469 1,5 %A A163469 _Zak Seidov_, Jul 28 2009