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 A025507 #18 Aug 11 2016 12:16:38 %S A025507 11,92,377,470,6351,6968,7175,7268,7565,7970,20337,20370,21981,22008, %T A025507 25637,25664,25691,27968,39183,39210,42397,43128,43149,48636,48729, %U A025507 48756,49013,49040,49067,49094,49863,50080,50089,50386,50413,50958,51343,52242 %N A025507 Least k such that the first k terms of A006928 contain n more 2's than 1's. %C A025507 a(n)=i => i is the smallest index such that A088568(i)=-n. - _Paolo Bonzini_, Jul 06 2016. %H A025507 Paolo Bonzini, <a href="/A025507/b025507.txt">Table of n, a(n) for n = 1..86</a> %Y A025507 Cf. A006928, A088568, A025506, A274775. %K A025507 nonn %O A025507 1,1 %A A025507 _David W. Wilson_