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 A241720 #6 Apr 28 2014 09:39:51 %S A241720 1,1,2,6,7,11,16,31,36,55,71,101,147,188,245,327,421,540,732,899,1154, %T A241720 1445,1831,2253,2846,3545,4352,5352,6576,7993,9778,11826,14314,17430, %U A241720 20866,25076,30043,35974,42776,51053,60463,71772,85094,100370,118155,139331 %N A241720 Number of compositions of n into distinct parts with exactly one descent. %H A241720 Alois P. Heinz, <a href="/A241720/b241720.txt">Table of n, a(n) for n = 3..1000</a> %e A241720 a(3) = 1: [2,1]. %e A241720 a(4) = 1: [3,1]. %e A241720 a(5) = 2: [3,2], [4,1]. %e A241720 a(6) = 6: [4,2], [5,1], [2,3,1], [3,1,2], [1,3,2], [2,1,3]. %e A241720 a(7) = 7: [4,3], [5,2], [6,1], [2,4,1], [4,1,2], [1,4,2], [2,1,4]. %e A241720 a(8) = 11: [6,2], [5,3], [7,1], [1,4,3], [3,1,4], [2,1,5], [3,4,1], [2,5,1], [5,1,2], [1,5,2], [4,1,3]. %e A241720 a(9) = 16: [5,4], [8,1], [7,2], [6,3], [2,6,1], [3,5,1], [6,1,2], [1,6,2], [2,1,6], [3,4,2], [4,2,3], [5,1,3], [2,4,3], [1,5,3], [3,2,4], [3,1,5]. %Y A241720 Column k=1 of A241719. %K A241720 nonn %O A241720 3,3 %A A241720 _Alois P. Heinz_, Apr 27 2014