OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 22*a(n-2) - 120*a(n-4).
Empirical g.f.: 4*x*(28 + 101*x - 300*x^2 - 1080*x^3) / ((1 - 10*x^2)*(1 - 12*x^2)). - Colin Barker, Oct 16 2018
EXAMPLE
Some solutions for n=5:
0 3 4 0 0 5 4 5 3 0 5 4 3 2 0 3 2 4 5 3
4 2 1 2 0 0 5 1 0 2 1 5 0 4 2 0 4 1 2 5
0 3 5 1 5 0 4 5 3 0 4 3 2 1 1 4 1 3 3 1
4 2 3 4 5 5 4 0 0 2 1 5 0 4 3 1 4 1 1 4
1 4 5 1 0 5 4 5 4 1 3 2 4 3 1 4 3 5 3 1
2 0 2 3 3 3 5 1 1 3 0 4 1 5 4 2 3 0 2 5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2013
STATUS
approved