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 A239557 #4 Mar 27 2014 12:11:00
%S A239557 1,1,1,2,4,8,16,31,61,120,235,460,901,1769,3471,6811,13367,26236,
%T A239557 51497,101079,198399,389428,764384,1500372,2945008,5780612,11346484,
%U A239557 22271478,43715623,85807323,168427136,330597667,648914509,1273723636,2500131931,4907390780
%N A239557 Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-7,...,7}.
%H A239557 Alois P. Heinz, <a href="/A239557/b239557.txt">Table of n, a(n) for n = 0..1000</a>
%Y A239557 Column k=7 of A239550.
%K A239557 nonn
%O A239557 0,4
%A A239557 _Alois P. Heinz_, Mar 21 2014