OFFSET
1,2
COMMENTS
Column 1 of A264172.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + a(n-2) + 2*a(n-3) + a(n-4) + a(n-5) -a(n-6).
Empirical g.f.: x*(1 + x)*(1 + 2*x + x^2 + x^3 - x^4) / ((1 + x^2)*(1 - x - 2*x^2 - x^3 + x^4)). - Colin Barker, Feb 25 2018
EXAMPLE
Some solutions for n=4:
..5..1....0..1....0..1....0..1....5..0....0..1....5..0....5..1....5..0....0..1
..0..2....2..3....7..3....7..2....2..1....7..3....7..1....0..3....2..1....2..3
..4..3....9..5....2..4....9..3....4..3....2..5....2..3....2..4....9..3....4..5
..6..7....4..7....6..5....4..5....6..7....4..6....4..6....6..7....4..7....6..7
..8..9....6..8....8..9....6..8....8..9....8..9....8..9....8..9....6..8....8..9
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 06 2015
STATUS
approved