OFFSET
1,1
COMMENTS
Row 3 of A255107.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/120)*n^5 + (1/4)*n^4 + (59/24)*n^3 + (93/4)*n^2 + (1321/30)*n + 11.
Empirical g.f.: x*(81 - 270*x + 360*x^2 - 237*x^3 + 78*x^4 - 11*x^5) / (1 - x)^6. - Colin Barker, Jan 24 2018
EXAMPLE
Some solutions for n=4:
1 0 2 0 2 0 2 0 2 0 2 0 1 0 0 0
0 2 1 1 0 0 2 2 0 0 0 2 1 0 1 0
0 0 1 1 0 0 2 1 0 0 0 1 2 0 0 0
0 0 1 1 1 0 2 2 1 0 1 1 0 0 0 1
1 1 1 2 1 0 0 2 1 0 1 2 2 1 0 2
1 2 0 0 2 1 0 2 1 0 0 2 2 2 0 2
1 1 2 1 2 2 2 1 2 0 2 1 2 2 0 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2015
STATUS
approved