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 A239556 #4 Mar 26 2014 16:11:29
%S A239556 1,1,1,2,4,8,16,31,60,117,228,441,860,1678,3267,6368,12413,24192,
%T A239556 47158,91929,179190,349306,680925,1327341,2587450,5043845,9832184,
%U A239556 19166364,37361945,72831417,141973854,276756612,539495115,1051664254,2050060645,3996283405
%N A239556 Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-6,...,6}.
%H A239556 Alois P. Heinz, <a href="/A239556/b239556.txt">Table of n, a(n) for n = 0..1000</a>
%Y A239556 Column k=6 of A239550.
%K A239556 nonn
%O A239556 0,4
%A A239556 _Alois P. Heinz_, Mar 21 2014