|
%I
%S 793,65425,1940673,43399990,836356119,15103463125,263422708979,
%T 4498700185621,75773483221458,1264058518607488,20939915070874170,
%U 345057032966423355,5662807472785412683,92633089841621699568
%N Number of 0..3 arrays of length 2*n+6 with sum less than 3*n in any length 2n subsequence (=less than 50% duty cycle)
%C Row 7 of A213464
%H R. H. Hardin, <a href="/A213471/b213471.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=3
%e ..0....0....2....2....2....0....0....0....0....0....2....2....0....0....2....0
%e ..0....0....0....0....2....2....0....0....2....0....0....2....2....0....0....0
%e ..0....2....0....2....0....2....0....0....0....2....0....2....2....0....2....2
%e ..0....2....0....2....0....2....0....2....2....0....2....2....0....2....0....0
%e ..2....0....2....0....2....0....2....2....0....0....2....0....0....0....0....0
%e ..3....1....1....0....0....1....0....0....1....2....0....0....0....1....0....0
%e ..2....0....0....0....3....0....3....0....0....2....2....2....0....1....1....2
%e ..0....0....0....3....0....1....3....1....2....0....0....1....2....1....0....2
%e ..0....0....0....0....1....0....0....0....1....2....0....2....0....1....1....0
%e ..0....1....2....2....1....3....0....0....0....0....2....0....3....2....2....0
%e ..0....1....1....1....0....2....2....2....2....0....2....3....2....0....3....1
%e ..1....1....0....2....3....0....0....1....1....3....0....0....0....3....0....0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jun 12 2012
| 