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 A191930 #4 Mar 30 2012 18:57:33 %S A191930 0,1,2,3,4,6,7,11,13,14,17,18,19,25,29,31,32,35,43,47,48,51,60,64,72, %T A191930 76,79,83,95,107,111,119,123,127,134,155,171,183,187,195,199,206,217, %U A191930 250,278,294,306,310,318,322,333,351,405,449,477,493,505,509,517 %N A191930 Ordered sequence of nonnegative differences f-4g, where f and g are Lucas numbers (A000032 beginning at 1). %t A191930 (See A191929.) %Y A191930 Cf. A191929, A191931, A191932. %K A191930 nonn %O A191930 1,3 %A A191930 _Clark Kimberling_, Jun 19 2011