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 A278518 #7 Nov 29 2016 22:39:55 %S A278518 1,3,4,1,3,4,2,2,4,1,4,3,2,2,4,3,2,3,1,3,4,2,3,3,3,3,2,2,3,3,1,3,4,2, %T A278518 3,3,2,2,4,2,3,4,3,4,1,4,3,2,3,3,3,3,2,2,2,4,3,2,3,2,2,4,1,3,4,2,2,4, %U A278518 3,3,3,3,4,2,3,3,3,3,3,4,3,1,3,4,2,3,4,3,4,2,3,3,3,2,3,3,2,3,2,3,3,3,3,2,1,3,4,2,3,3,2,3,3,2,3,3,3,1,4,3,2 %N A278518 First differences of A278517; run lengths in A260731. %H A278518 Antti Karttunen, <a href="/A278518/b278518.txt">Table of n, a(n) for n = 0..11363</a> %F A278518 a(n) = A278517(1+n) - A278517(n). %F A278518 a(n) = 1 + (A278519(n) - A278517(n)). %F A278518 a(n) = 1 + A278521(n) + A278522(n). %o A278518 (Scheme) %o A278518 (define (A278518 n) (- (A278517 (+ 1 n)) (A278517 n))) %Y A278518 Cf. A260731, A278516, A278517, A278519, A278521, A278522. %K A278518 nonn %O A278518 0,2 %A A278518 _Antti Karttunen_, Nov 28 2016