OFFSET
1,1
COMMENTS
Column 2 of A183642.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 10*a(n-1) - 35*a(n-2) + 50*a(n-3) - 24*a(n-4).
Conjectures from Colin Barker, Mar 31 2018: (Start)
G.f.: 4*x*(34 - 255*x + 578*x^2 - 384*x^3) / ((1 - x)*(1 - 2*x)*(1 - 3*x)*(1 - 4*x)).
a(n) = 18 + 3*2^(3+n) + 2*3^(2+n) + 4^(1+n).
(End)
EXAMPLE
Some solutions for 5 X 3:
2 2 0 0 0 1 1 2 1 1 2 0 0 3 0 3 0 1 3 1 2
0 2 2 3 3 2 0 3 0 2 1 3 1 2 1 0 3 2 1 1 2
2 2 0 0 0 1 1 2 1 1 2 0 2 1 2 2 1 0 3 1 2
0 2 2 3 3 2 3 0 3 0 3 1 3 0 3 0 3 2 1 1 2
3 1 1 0 0 1 0 3 0 1 2 0 3 0 3 3 0 1 1 3 0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2011
STATUS
approved