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 A249715 #11 Nov 04 2014 16:38:25 %S A249715 0,4,6,13,15,27,47,55,111,223,447,895,1791,3583,7167,14335,28671, %T A249715 57343,114687,229375,458751,917503,1835007,3670015,7340031,14680063, %U A249715 29360127,58720255,117440511 %N A249715 Positions of records in A249695. %C A249715 From n=8 [a(8)=55] onward, the terms seem to be given by A086224(n-5), i.e. as (7 * 2^(n-5)) - 1. %Y A249715 A249714 gives the corresponding record values. %Y A249715 Cf. A249695, A086224, A249440. %K A249715 nonn %O A249715 1,2 %A A249715 _Charles R Greathouse IV_ & _Antti Karttunen_, Nov 04 2014