OFFSET
1,1
COMMENTS
Column 5 of A222345.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..24
FORMULA
Empirical: a(n) = 11*a(n-1) - 45*a(n-2) + 84*a(n-3) - 70*a(n-4) + 21*a(n-5) - a(n-6).
Empirical g.f.: x*(462 - 3368*x + 8341*x^2 - 8095*x^3 + 2611*x^4 - 126*x^5) / (1 - 11*x + 45*x^2 - 84*x^3 + 70*x^4 - 21*x^5 + x^6). - Colin Barker, Aug 16 2018
EXAMPLE
Some solutions for n=3:
..0....0....1....0....1....2....3....3....0....0....3....3....1....1....0....2
..1....0....3....4....2....1....0....1....2....0....2....3....0....2....0....1
..1....5....0....0....0....0....1....0....0....3....2....0....2....2....2....0
..1....0....0....0....0....2....0....1....0....4....0....0....0....0....0....0
..0....0....0....3....0....2....3....1....5....0....0....0....2....0....0....1
..0....0....0....1....0....0....0....0....0....0....0....0....2....1....2....0
..1....0....3....0....4....1....0....2....0....1....0....0....0....2....1....1
..4....3....1....0....1....0....1....0....1....0....1....2....1....0....3....3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 16 2013
STATUS
approved