OFFSET
1,1
COMMENTS
Row 4 of A255107.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/120)*n^5 + (7/24)*n^4 + (85/24)*n^3 + (1505/24)*n^2 + (2809/20)*n + 30 for n>2.
Empirical g.f.: x*(243 - 836*x + 1050*x^2 - 447*x^3 - 219*x^4 + 339*x^5 - 156*x^6 + 27*x^7) / (1 - x)^6. - Colin Barker, Jan 24 2018
EXAMPLE
Some solutions for n=4:
1 1 0 0 2 2 1 2 0 0 2 2 1 2 0 0
1 1 0 2 0 0 2 0 0 2 2 2 2 0 1 2
1 2 0 1 1 0 2 2 2 1 2 2 0 0 1 1
0 2 1 1 1 0 1 2 2 1 2 2 0 0 2 2
0 2 2 1 1 1 2 2 2 1 1 2 2 0 2 2
0 2 2 2 2 2 2 2 2 2 1 1 2 1 0 2
1 2 0 0 1 2 2 0 2 2 2 1 2 2 2 2
0 2 0 0 1 2 0 2 0 2 2 2 1 1 2 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2015
STATUS
approved