OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 182*a(n-2) - 9024*a(n-4) + 66960*a(n-6).
Empirical g.f.: 4*x*(142 + 1315*x - 13696*x^2 - 126860*x^3 + 110640*x^4 + 1033800*x^5) / ((1 - 90*x^2)*(1 - 92*x^2 + 744*x^4)). - Colin Barker, Oct 14 2018
EXAMPLE
Some solutions for n=3:
2 4 5 2 7 6 7 4 7 0 2 3 7 3 6 2 0 1 2 4
3 2 0 0 7 3 0 0 7 3 3 1 1 0 5 4 2 0 6 5
2 4 3 6 1 0 5 2 3 2 6 1 2 4 5 7 2 3 2 4
1 0 1 7 2 4 3 3 4 0 6 4 6 5 5 4 2 0 2 7
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 21 2013
STATUS
approved