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 A242717 #17 May 22 2014 09:02:10 %S A242717 1,1,2,3,5,6,9,11,15,18,23,27,34,39,47,54,64,72,84,94,108,120,135,149, %T A242717 167,182,202,220,241,261,284,305,331,354,380,406,434,460,491,519,550, %U A242717 581,613,643,679,709,743,777,811,843,882,913,951,986,1022,1054 %N A242717 The number of ways that a score of n can be obtained using four darts on a standard dartboard. %C A242717 It is assumed that each of the four darts scores. %H A242717 Colin Barker, <a href="/A242717/b242717.txt">Table of n, a(n) for n = 4..240</a> %H A242717 Wikipedia, <a href="http://en.wikipedia.org/wiki/Darts">Darts</a> %e A242717 a(4) = 1 because the only possible throw is (1,1,1,1). %e A242717 a(7) = 3 because possible throws are (1,1,1,4), (1,1,2,3) and (1,2,2,2). %e A242717 a(223) = 0 because it is not possible to get a score of 223. %Y A242717 Cf. A241746, A242678, A242681, A242718. %K A242717 nonn,fini,full %O A242717 4,3 %A A242717 _Colin Barker_, May 21 2014