OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 118*a(n-2) - 3660*a(n-4) + 10800*a(n-6).
Empirical g.f.: 4*x*(90 + 679*x - 5516*x^2 - 41684*x^3 + 16560*x^4 + 131040*x^5) / ((1 - 60*x^2)*(1 - 58*x^2 + 180*x^4)). - Colin Barker, Oct 15 2018
EXAMPLE
Some solutions for n=4:
2 4 0 5 1 3 4 6 3 4 1 2 2 2 0 3 4 2 0 1
1 0 2 4 5 4 2 1 2 0 1 5 3 0 0 0 4 5 3 1
2 4 3 2 0 2 1 3 3 4 0 1 5 5 1 4 2 0 2 3
5 4 0 2 3 2 1 0 2 0 3 1 6 3 5 5 2 3 4 2
4 0 2 1 4 0 4 0 5 6 4 5 6 6 3 6 1 5 6 1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 28 2013
STATUS
approved