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 A241723 #5 Apr 28 2014 09:48:32 %S A241723 1,1,2,3,5,7,67,70,132,194,315,436,674,2046,2401,3948,5669,8582,11784, %T A241723 17312,23187,47121,56974,86078,116892,169282,223496,316211,413133, %U A241723 565423,879530,1111950,1523112,2042569,2744398,3588200,4804470,6199849,8142059,10485846 %N A241723 Number of compositions of n into distinct parts with exactly four descents. %H A241723 Alois P. Heinz, <a href="/A241723/b241723.txt">Table of n, a(n) for n = 15..1000</a> %e A241723 a(20) = 7: [7,6,4,2,1], [8,5,4,2,1], [10,4,3,2,1], [8,6,3,2,1], [9,5,3,2,1], [6,5,4,3,2], [7,5,4,3,1]. %Y A241723 Column k=4 of A241719. %K A241723 nonn %O A241723 15,3 %A A241723 _Alois P. Heinz_, Apr 27 2014