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 A242681 #8 May 21 2014 09:18:16 %S A242681 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,11,11,12,12,13,13,13, %T A242681 13,13,13,14,14,14,14,14,14,15,15,15,15,15,14,15,14,14,14,14,14,16,14, %U A242681 15,14,14,13,15,13,15,13,13,12,14,11,14,11,11,10,11,8,12,8,8,9,9,6,10,6,6,7,6,4,8,4,4,6,4,3,7,2,3,5,2,2,5,1,2,4,2,1,4,0,1,3,0,1,3,0,1,2,0,0,2,0,0,1,0,0,1 %N A242681 The number of ways that a score of n can be obtained using two darts on a standard dartboard. %C A242681 It is assumed that each of the two darts scores. %H A242681 Wikipedia, <a href="http://en.wikipedia.org/wiki/Darts">Darts</a> %e A242681 a(2) = 1 because the only possible throw is (1,1). %e A242681 a(7) = 3 because possible throws are (1,6), (2,5) and (3,4). %e A242681 a(103) = 0 because it is not possible to get a score of 103. %Y A242681 Cf. A241746, A242678, A242717, A242718. %K A242681 nonn,fini,full %O A242681 2,3 %A A242681 _Colin Barker_, May 20 2014