OFFSET
1,1
COMMENTS
Column 1 of A185777.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n)= 3*a(n-1) +96*a(n-3) +504*a(n-4) +792*a(n-5) +2304*a(n-6) -13824*a(n-8) -13824*a(n-9).
Empirical: G.f.: -x*(-81 -315*x -2170*x^2 -7476*x^3 -11880*x^4 -21720*x^5 +25200*x^6 +177120*x^7 +155520*x^8) / ( (24*x^3+24*x^2+3*x-1) *(576*x^6-72*x^4-24*x^2-1) ). - R. J. Mathar, Jan 08 2015
EXAMPLE
Some solutions for 3 X 2:
..2..1....0..2....2..1....2..1....0..1....0..2....1..2....0..0....2..1....0..1
..0..2....2..2....0..1....1..1....2..1....1..0....2..0....2..1....0..2....0..2
..0..0....0..0....1..0....0..2....2..0....2..2....1..1....1..1....1..1....2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 03 2011
STATUS
approved