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 A047706 #11 Nov 09 2018 14:06:21 %S A047706 2,3,1,5,3,7,1,1,2,5,1,3,1,2,3,1,9,1,1,2,4,5,4,7,2,1,2,2,4,1,4,1,2,3, %T A047706 3,1,1,5,4,5,3,1,5,2,1,3,6,7,2,1,4,3,5,2,2,1,1,10,1,1,4,7,1,1,4,1,1,4, %U A047706 4,6,5,1,1,4,2,2,7,2,8,7,1,1,6,1,3,1,3,6,5,3,1,5,2,1,1,3,4,1,3,4 %N A047706 Second differences of A047699. %H A047706 Andrew Weimholt, <a href="/A047706/b047706.txt">Table of n, a(n) for n = 0..999</a> %Y A047706 Cf. A047699, A047705. %K A047706 nonn %O A047706 0,1 %A A047706 _N. J. A. Sloane_ %E A047706 Corrected by _Zak Seidov_ and _Andrew Weimholt_, Jul 13 2010