%I A039647
%S A039647 1,3,8,42,264,2160,20880,236880,3064320,44634240,722131200,12853209600,
%T A039647 249559833600,5249378534400,118911189196800,2886037330176000,
%U A039647 74715282690048000,2055161959538688000,59855791774851072000
%N A039647 Related to A000032 (Lucas numbers): (n-1)!*L(n).
%C A039647 Number of possible well-colored circuits.
%H A039647 C. Banderier, J.-M. Le Bars and V. Ravelomanana, <a href="http://arxiv.org/
               abs/math.CO/0411138">Generating functions for kernels of digraphs</
               a>
%F A039647 a(n) = (n-1)!*L(n), L(n) := A000032(n); E.g.f.: -ln(1-x-x^2). Also a(n)/
               n! = sum(binomial(n-j, j)/(n-j), j=0..floor(n/2)).
%Y A039647 a(n) = A039692(n, 1) (first column of Fibonacci Jabotinsky-triangle).
%Y A039647 Sequence in context: A038048 A051763 A074435 this_sequence A071533 A000240 
               A132103
%Y A039647 Adjacent sequences: A039644 A039645 A039646 this_sequence A039648 A039649 
               A039650
%K A039647 easy,nonn
%O A039647 1,2
%A A039647 Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)