OFFSET
1,1
COMMENTS
Column 1 of A185477
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = (1/362880)*n^9
+ (1/1008)*n^8
+ (431/12096)*n^7
+ (373/720)*n^6
+ (82453/17280)*n^5
+ (637/18)*n^4
+ (2819461/18144)*n^3
+ (119729/315)*n^2
+ (605807/1260)*n
+ 112
EXAMPLE
Some solutions for 4X3
..1..1..2....0..1..2....0..0..0....0..1..2....0..0..1....0..0..0....0..0..2
..1..1..2....0..1..2....0..0..2....0..1..2....0..1..1....0..0..2....0..2..2
..1..2..1....0..1..2....0..2..1....1..1..0....0..2..2....0..1..0....1..0..1
..2..0..1....2..1..2....2..0..0....2..0..1....1..0..1....0..2..0....2..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 28 2011
STATUS
approved