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 A139311 #6 Aug 31 2013 19:33:48 %S A139311 11,2,141,5,51,60,21,127,129,24,19,54,8,57,25,9,16,4,56,53,7,10,73, %T A139311 574,47,607,6,48,20,87,3,8808,90,96,31,537,15,84,219,121,97,22,45,226, %U A139311 52,35,223,55,111,63,112,531,13,49,113,80,119,17,1193,2120,161,2235,123,561 %N A139311 First differences of A139310. %D A139311 E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris. %H A139311 J. Schoenfield, <a href="/A139311/b139311.txt">Table of n, a(n) for n = 1..1000</a> %K A139311 nonn %O A139311 1,1 %A A139311 _N. J. A. Sloane_, Jun 08 2008 %E A139311 More terms from _Jon E. Schoenfield_, May 23 2010