OFFSET
1,1
COMMENTS
Column 3 of A201700.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (3/2)*n^4 + (4/3)*n^3 - 4*n^2 - (29/6)*n + 9.
Conjectures from Colin Barker, May 23 2018: (Start)
G.f.: x*(3 + 3*x + 56*x^2 - 35*x^3 + 9*x^4) / (1 - x)^5.
a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n>5.
(End)
EXAMPLE
Some solutions for n=4:
..1..2..2....0..0..1....0..2..2....0..2..2....1..1..2....0..0..2....0..0..2
..1..2..2....0..2..0....2..0..1....1..1..2....1..2..1....0..2..0....0..1..0
..2..1..2....0..2..0....2..0..1....1..2..0....2..0..1....2..0..0....2..0..0
..2..2..0....2..0..0....2..1..0....2..0..0....2..1..0....2..0..0....2..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 03 2011
STATUS
approved