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 A290092 #5 Jul 26 2017 09:28:30 %S A290092 1,1,2,1,1,2,2,2,4,1,1,2,1,1,2,2,2,4,2,2,6,2,2,6,4,4,8,1,1,2,1,1,2,2, %T A290092 2,4,1,1,2,1,1,2,2,2,4,2,2,6,2,2,6,4,4,8,2,2,6,2,2,6,6,6,12,2,2,6,2,2, %U A290092 6,6,6,12,4,4,12,4,4,12,8,8,16,1,1,2,1,1,2,2,2,4,1,1,2,1,1,2,2,2,4,2,2,6,2,2,6,4,4,8,1,1,2,1 %N A290092 Filter based on 2-digits of base-3 expansion: a(n) = A278222(A289814(n)). %H A290092 Antti Karttunen, <a href="/A290092/b290092.txt">Table of n, a(n) for n = 0..19683</a> %F A290092 a(n) = A278222(A289814(n)). %o A290092 (Scheme) (define (A290092 n) (A278222 (A289814 n))) %Y A290092 Cf. A278222, A289814, A290091, A290093. %K A290092 nonn %O A290092 0,3 %A A290092 _Antti Karttunen_, Jul 25 2017