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 A143190 #7 Oct 13 2013 17:17:35 %S A143190 10,29,41,43,40,44,26,21,15,15,18,18,18,10,10,5,5,5,5,5,5,5,5,5,5,5,5, %T A143190 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5 %N A143190 a(n) is the smallest natural number we cannot obtain from n, n+1, n+2, n+3 and the operators +, -, *, /, using each number only once. %C A143190 This sequence is related to the sequences A071110 (for 5 successive integers) and A060316 (for 6 successive integers) and others sequences to come... %C A143190 Asymptotically (in fact as soon as n>=15), the sequence tends to 5. %Y A143190 Cf. A071110, A060316, A071107, A060315, A141494, A142153. %K A143190 nonn %O A143190 1,1 %A A143190 _Gilles A.Fleury_, Oct 18 2008