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 A092459 #7 Feb 22 2013 21:28:45 %S A092459 0,3,4,6,7,8,9,10,11,12,13,15,16,17,18,19,20,21,22,23,24,25,26,27,28, %T A092459 29,30,31,32,33,34,35,36,37,38,39,40,41,43,44,45,46,47,48,49,50,51,52, %U A092459 53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79 %N A092459 Numbers that are not Catalan numbers (A000108). %C A092459 Complement of A000108; A010058(a(n)) = 0. [_Reinhard Zumkeller_, Mar 29 2011] %K A092459 nonn %O A092459 1,2 %A A092459 _N. J. A. Sloane_, Mar 26 2004