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 A239554 #4 Mar 24 2014 17:28:40
%S A239554 1,1,1,2,4,8,15,28,52,97,183,344,647,1219,2295,4322,8140,15338,28899,
%T A239554 54449,102588,193297,364219,686272,1293113,2436562,4591090,8650808,
%U A239554 16300370,30714116,57873375,109048498,205475699,387169634,729528290,1374621010,2590143467
%N A239554 Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-4,...,4}.
%H A239554 Alois P. Heinz, <a href="/A239554/b239554.txt">Table of n, a(n) for n = 0..1000</a>
%Y A239554 Column k=4 of A239550.
%K A239554 nonn
%O A239554 0,4
%A A239554 _Alois P. Heinz_, Mar 21 2014