cp's OEIS Frontend

A239552 Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-2,...,2}.

%I A239552 #7 Aug 28 2014 03:54:55
%S A239552 1,1,1,2,4,7,11,18,32,53,89,152,255,431,733,1243,2111,3583,6087,10342,
%T A239552 17564,29845,50704,86150,146382,248716,422618,718091,1220156,2073272,
%U A239552 3522846,5985967,10171232,17282786,29366645,49899299,84788109,144070585,244802450
%N A239552 Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-2,...,2}.
%H A239552 Alois P. Heinz, <a href="/A239552/b239552.txt">Table of n, a(n) for n = 0..1000</a>
%F A239552 a(n) ~ c * d^n, where d = 1.6991842071646453928920987915033839182675484195426953647249305754952..., c = 0.4361924842463814839782496098129122542027259655263562779280217228428... . - _Vaclav Kotesovec_, Aug 28 2014
%e A239552 a(5) = 7: [1,1,1,1,1], [1,1,1,2], [1,1,2,1], [1,1,3], [1,2,1,1], [1,2,2], [1,4].
%e A239552 a(6) = 11: [1,1,1,1,1,1], [1,1,1,1,2], [1,1,1,2,1], [1,1,1,3], [1,1,2,1,1], [1,1,2,2], [1,2,1,1,1], [1,2,1,2], [1,2,2,1], [1,2,3], [1,5].
%Y A239552 Column k=2 of A239550.
%K A239552 nonn
%O A239552 0,4
%A A239552 _Alois P. Heinz_, Mar 21 2014