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 A214319 #4 Jul 12 2012 13:46:54 %S A214319 1,1,2,5,9,19,37,74,149,297,594,1189,2377,4755,9509,19018,38037,76073, %T A214319 152147,304293,608586,1217173,2434345,4868690,9737381,19474761, %U A214319 38949523,77899045,155798090,311596181,623192361,1246384722,2492769445,4985538889,9971077779,19942155557,39884311114,79768622229 %N A214319 First differences of A182028. %Y A214319 Cf. A003842, A003849, A182028. %K A214319 nonn %O A214319 0,3 %A A214319 _N. J. A. Sloane_, Jul 12 2012