OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 72*a(n-2) - 1712*a(n-4) + 13440*a(n-6).
Empirical g.f.: 4*x*(58 + 287*x - 2808*x^2 - 13828*x^3 + 33600*x^4 + 164640*x^5) / ((1 - 20*x^2)*(1 - 24*x^2)*(1 - 28*x^2)). - Colin Barker, Oct 16 2018
EXAMPLE
Some solutions for n=5:
0 6 1 3 4 1 4 0 6 0 1 5 1 5 0 0 5 3 0 2
1 2 4 1 4 6 5 6 1 0 5 4 6 5 0 5 1 4 5 2
0 6 3 5 6 3 4 0 0 4 6 0 6 0 0 0 2 0 3 5
5 6 4 1 4 6 3 4 5 4 5 4 4 3 1 6 3 6 3 0
0 6 0 2 6 3 6 2 2 6 1 5 1 5 5 5 2 0 3 5
5 6 6 3 0 2 3 4 6 5 1 0 4 3 0 5 2 5 6 3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2013
STATUS
approved