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 A285981 #15 Apr 30 2017 16:00:33 %S A285981 0,0,0,0,1,2,3,10,20,44,67,149,277,528,959,1673,3107,5572,9992,17801, %T A285981 31647,55379,98445,173288,305355,536709,943353,1655316,2900221, %U A285981 5088098,8916905,15624332,27368888,47935241,83939143,146974040,257277523,450432510,788487147 %N A285981 Number of Carlitz compositions having at least two identical parts. %H A285981 Alois P. Heinz, <a href="/A285981/b285981.txt">Table of n, a(n) for n = 0..4100</a> %F A285981 a(n) = A003242(n) - A032020(n). %e A285981 For n=7, there are a(7) = 10 Carlitz compositions with at least two identical parts: 1,5,1; 2,3,2; 3,1,3; 1,2,1,3; 1,2,3,1; 1,3,1,2; 1,3,2,1; 2,1,3,1; 3,1,2,1 and 1,2,1,2,1. %Y A285981 Cf. A003242, A032020. %K A285981 nonn %O A285981 0,6 %A A285981 _Gregory L. Simay_, Apr 29 2017 %E A285981 More terms from _Alois P. Heinz_, Apr 29 2017