OFFSET
1,1
COMMENTS
Row 3 of A213962
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (n+3) *(n+2) *(449*n^5+3038*n^4+7759*n^3+9790*n^2+6264*n+1680) *(1+n)^2/10080.
EXAMPLE
Some solutions for n=4
..2..0..0....4..0..0....4..0..0....2..0..0....0..3..0....2..2..0....1..3..0
..0..0..0....0..1..2....0..2..4....0..2..2....2..1..2....2..2..2....1..4..2
..1..4..2....0..0..1....0..3..3....0..3..1....2..4..0....0..4..3....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 28 2012
STATUS
approved