OFFSET
1,3
COMMENTS
Row 5 of A187507
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..50
FORMULA
Empirical: a(n) = 51*n^2 - 208*n + 200 for n>3.
Empirical G.f.: x^3*(40+64*x+3*x^2-5*x^3)/(1-x)^3. [Colin Barker, Jan 22 2012]
EXAMPLE
Some solutions for 4X4
..0..0..0..0....0..0..0..0....0..0..0..0....4..0..0..0....0..1..0..0
..0..0..0..0....0..0..0..0....4..5..0..0....5..3..1..0....0..2..0..0
..0..5..3..1....0..0..4..5....2..3..0..0....0..0..2..0....0..3..4..5
..0..0..4..2....0..1..2..3....0..1..0..0....0..0..0..0....0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2011
STATUS
approved