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 A047705 #10 Nov 09 2018 14:05:55 %S A047705 1,3,6,7,12,15,22,23,24,26,31,32,35,36,38,41,42,51,52,53,55,59,64,68, %T A047705 75,77,78,80,82,86,87,91,92,94,97,100,101,102,107,111,116,119,120,125, %U A047705 127,128,131,137,144,146,147,151,154,159,161,163,164,165 %N A047705 First differences of A047699. %H A047705 Andrew Weimholt, <a href="/A047705/b047705.txt">Table of n, a(n) for n = 0..999</a> %H A047705 K. S. Brown, <a href="http://www.mathpages.com/home/kmath509/kmath509.htm">Expulsion Sets</a> %Y A047705 Cf. A047699, A047706. %K A047705 nonn %O A047705 0,2 %A A047705 _N. J. A. Sloane_ %E A047705 Corrected by _Zak Seidov_ and _Andrew Weimholt_, Jul 13 2010