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 A278522 #5 Nov 29 2016 22:40:12 %S A278522 0,0,1,0,0,0,1,1,2,0,1,1,1,0,1,2,1,2,0,0,2,1,1,0,2,2,1,1,1,1,0,0,2,1, %T A278522 2,2,1,0,1,0,0,0,0,2,0,1,1,1,1,1,2,2,0,1,0,2,2,1,1,1,1,2,0,0,2,1,0,0, %U A278522 0,0,0,0,1,1,1,0,0,0,0,1,2,0,0,0,0,0,0,0,2,1,1,0,2,1,2,2,1,1,1,1,2,2,2,1,0,0,1,1,2,2,1,2,2,1,1,1,2,0,1,2,1 %N A278522 a(n) = A278519(n) - A276573(n). %C A278522 First 3 occurs as a(133). %H A278522 Antti Karttunen, <a href="/A278522/b278522.txt">Table of n, a(n) for n = 0..10028</a> %F A278522 a(n) = A278519(n) - A276573(n). %o A278522 (Scheme) (define (A278522 n) (- (A278519 n) (A276573 n))) %Y A278522 Cf. A276573, A278518, A278519, A278521. %K A278522 nonn %O A278522 0,9 %A A278522 _Antti Karttunen_, Nov 28 2016