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 A263277 #6 Nov 09 2015 16:15:10 %S A263277 21,3,8480,1356,18162,149,78495,291,1194707,8567,1426107,4090,6029619, %T A263277 59748,325034101,95590 %N A263277 First differences of A263276; length of n-th run of terms of same parity in A259934. %F A263277 a(n) = A263276(n) - A263276(n-1). %o A263277 (Scheme) (define (A263277 n) (if (zero? n) n (- (A263276 n) (A263276 (- n 1))))) %Y A263277 Cf. A259934, A263276. %Y A263277 Bisections: A263278, A262516. %K A263277 nonn,more %O A263277 1,1 %A A263277 _Antti Karttunen_, Nov 08 2015