OFFSET
1,1
COMMENTS
Column 2 of A203101.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 10*a(n-1) -a(n-2) +236*a(n-3) +270*a(n-4) +945*a(n-5) +532*a(n-6) +576*a(n-7).
Empirical g.f.: 2*x*(2 + 22*x + 122*x^2 + 300*x^3 + 543*x^4 + 472*x^5 + 288*x^6) / (1 - 10*x + x^2 - 236*x^3 - 270*x^4 - 945*x^5 - 532*x^6 - 576*x^7). - Colin Barker, Jun 04 2018
EXAMPLE
Some solutions for n=5:
..3..3....0..3....1..1....3..2....1..3....0..3....0..0....1..3....3..0....0..0
..1..1....3..3....0..1....3..1....2..3....1..3....3..0....3..3....3..3....1..2
..0..3....2..1....1..1....1..2....1..3....1..1....3..1....3..2....0..3....0..3
..1..3....1..2....3..2....0..2....2..2....0..2....2..0....2..2....2..1....3..3
..1..2....1..2....3..0....0..0....1..1....3..3....2..2....2..0....2..2....1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2011
STATUS
approved