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 A191919 #5 Mar 30 2012 18:57:33
%S A191919 0,1,2,3,4,5,7,9,10,11,12,13,15,16,18,19,21,23,25,27,29,32,33,35,39,
%T A191919 40,41,45,47,51,54,55,57,62,65,68,70,74,76,83,87,90,91,93,101,105,109,
%U A191919 115,117,121,123,134,141,145,148,149,151,163,170,177,185,191
%N A191919 Ordered sequence of nonnegative differences c*f-d*g, where f and g are Lucas numbers (A000032 beginning at 1) and {c,d}={1,2}.
%t A191919 (See A191916.)
%Y A191919 Cf. A191916, A191917, A191918.
%K A191919 nonn
%O A191919 1,3
%A A191919 _Clark Kimberling_, Jun 19 2011