OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 21*a(n-1) - 79*a(n-2) - 41*a(n-3) + 72*a(n-4) + 28*a(n-5).
Empirical g.f.: x*(2 - 28*x + 38*x^2 + 75*x^3 + 18*x^4) / ((1 - x)*(1 - 5*x - 2*x^2)*(1 - 15*x - 14*x^2)). - Colin Barker, Oct 10 2018
EXAMPLE
Some solutions for n=5:
..0..1....0..0....0..1....0..1....0..1....0..0....0..0....0..0....0..1....0..1
..1..1....1..2....0..0....0..2....1..1....1..2....1..2....1..0....2..2....0..2
..2..0....5..1....0..4....2..2....2..2....1..2....2..2....0..0....2..4....2..0
..1..2....1..5....2..0....4..4....2..2....5..5....1..0....2..2....4..4....1..0
..0..0....5..1....1..2....4..5....1..1....4..5....1..1....1..5....5..5....0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 06 2013
STATUS
approved