OFFSET
1,1
COMMENTS
Column 3 of A183632.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 6*a(n-1) - 11*a(n-2) + 6*a(n-3).
Conjectures from Colin Barker, Mar 30 2018: (Start)
G.f.: x*(115 - 501*x + 486*x^2) / ((1 - x)*(1 - 2*x)*(1 - 3*x)).
a(n) = 50 + 7*2^(2+n) + 3^(1+n).
(End)
EXAMPLE
Some solutions for 3 X 4:
1 1 2 2 1 1 1 1 0 2 1 1 1 1 1 1 0 2 2 2
1 1 0 0 0 2 0 2 2 0 1 1 1 1 1 1 2 0 0 0
1 1 2 2 1 1 1 1 1 1 2 0 0 2 0 2 0 2 2 2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved