OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) + 41*a(n-2) - 164*a(n-3) - 558*a(n-4) + 2232*a(n-5) + 2520*a(n-6) - 10080*a(n-7).
Empirical g.f.: 2*x*(84 + 7*x - 3626*x^2 - 189*x^3 + 51948*x^4 + 1260*x^5 - 246960*x^6) / ((1 - 4*x)*(1 - 12*x^2)*(1 - 14*x^2)*(1 - 15*x^2)). - Colin Barker, Oct 16 2018
EXAMPLE
Some solutions for n=5:
6 2 0 4 5 3 2 0 0 6 4 1 2 3 3 3 6 0 3 1
0 2 2 0 1 5 2 6 6 6 0 3 6 1 6 0 2 2 0 4
6 2 0 4 2 0 6 4 0 6 6 3 0 1 3 3 6 0 3 1
4 6 3 1 0 4 2 6 1 1 3 6 5 0 6 0 4 4 0 4
4 0 2 6 2 0 2 0 6 0 4 1 4 5 4 4 6 0 6 4
0 2 2 0 2 6 2 6 0 0 3 6 6 1 6 0 2 2 1 5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2013
STATUS
approved