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 A081689 #7 Nov 23 2014 03:56:59 %S A081689 0,2,6,11,17,25,34,44,55,68,82,97,113,130,149,169,190,212,235,259,284, %T A081689 311,339,368,398,429,461,494,528,564,601,639,678,718,759,801,844,888, %U A081689 934,981,1029,1078,1128,1179,1231,1284,1338,1393,1450,1508,1567,1627,1688 %N A081689 A005228 - 1. %C A081689 From P-positions in a certain game. %H A081689 A. S. Fraenkel, <a href="http://www.wisdom.weizmann.ac.il/~fraenkel/">Home Page</a> %H A081689 A. S. Fraenkel, <a href="http://www.emis.de/journals/INTEGERS/papers/eg6/eg6.Abstract.html">New games related to old and new sequences</a>, INTEGERS, Electronic J. of Combinatorial Number Theory, Vol. 4, Paper G6, 2004. %F A081689 See A081688 for a recurrence. %Y A081689 Cf. A030124, A005228, A081688. %K A081689 nonn %O A081689 0,2 %A A081689 _N. J. A. Sloane_, Apr 02 2003