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 A239559 #4 Mar 30 2014 09:01:08
%S A239559 1,1,1,2,4,8,16,32,63,125,248,491,973,1929,3819,7571,15010,29749,
%T A239559 58971,116904,231735,459378,910649,1805210,3578545,7093916,14062567,
%U A239559 27876856,55261542,109547385,217160649,430487234,853373928,1691681061,3353494567,6647781207
%N A239559 Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-9,...,9}.
%Y A239559 Column k=9 of A239550.
%K A239559 nonn
%O A239559 0,4
%A A239559 _Alois P. Heinz_, Mar 21 2014