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 A276605 #5 Sep 12 2016 17:03:01 %S A276605 0,1,1,2,1,1,2,2,3,1,1,2,2,2,2,3,2,3,3,2,4,1,1,2,2,2,2,3,2,3,3,2,4,3, %T A276605 2,4,4,2,3,3,2,4,3,2,3,4,2,4,4,5,1,1,2,2,2,2,3,2,3,3,2,4,3,2,4,4,2,3, %U A276605 3,2,4,3,2,3,4,2,4,4,5,3,2,3,4,2,4,4,5,4,4,5,2,3,3,2,4,3,2,3,4,2,4,4,5,3,2,3,4,2,4,4,4,4,4,5,2,4,4,4,4,4,5 %N A276605 After a(0)=0, the first differences of A276603. %H A276605 Antti Karttunen, <a href="/A276605/b276605.txt">Table of n, a(n) for n = 0..6250</a> %F A276605 a(n) = A276604(n) / 2. %F A276605 a(0) = 0; for n >= 1, a(n) = A276603(n) - A276603(n-1). %o A276605 (Scheme, two alternatives) %o A276605 (define (A276605 n) (/ (A276604 n) 2)) %o A276605 (define (A276605 n) (if (zero? n) n (- (A276603 n) (A276603 (- n 1))))) %Y A276605 Cf. A276603, A276604, A276623. %K A276605 nonn,base %O A276605 0,4 %A A276605 _Antti Karttunen_, Sep 11 2016