OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) - 11*a(n-2) + 4*a(n-3) - 14*a(n-4) + 48*a(n-5) - 48*a(n-6) + 16*a(n-7).
Empirical g.f.: x*(1 - x)^2 / (1 - 7*x + 11*x^2 - 4*x^3 + 14*x^4 - 48*x^5 + 48*x^6 - 16*x^7). - Colin Barker, Sep 29 2018
EXAMPLE
Some solutions for n=7:
0 1 0 0 0 0 0 1 0 1 0 0 0 0 0 1 0 0 0 0
0 0 1 0 0 1 2 0 0 2 1 0 0 1 0 0 0 1 2 2
1 0 1 0 1 2 2 2 1 2 2 1 0 1 1 0 1 2 2 2
1 2 0 0 1 2 0 2 0 1 0 2 0 2 1 0 0 2 2 0
1 1 0 1 0 1 2 0 0 0 2 0 2 2 2 2 2 1 2 0
0 2 1 2 2 0 1 2 2 1 1 1 0 2 2 2 1 1 1 2
2 2 1 1 2 2 1 1 1 1 2 1 0 1 2 0 2 1 1 1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 12 2013
STATUS
approved