OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 25*a(n-1) - 134*a(n-2) + 134*a(n-3) - 25*a(n-4) +a(n-5).
Empirical g.f.: x*(2 - 34*x + 93*x^2 - 22*x^3 + x^4) / ((1 - x)*(1 - 18*x + x^2)*(1 - 6*x + x^2)). - Colin Barker, Oct 08 2018
EXAMPLE
Some solutions for n=5:
..0..1....0..0....0..0....0..1....0..1....0..1....0..0....0..1....0..1....0..1
..2..1....1..1....1..2....2..2....0..1....1..0....1..2....2..0....2..5....0..2
..2..2....2..1....5..4....1..2....0..1....2..0....0..2....2..1....5..5....4..2
..1..2....5..1....3..3....0..1....0..2....4..0....0..0....5..1....2..2....5..2
..2..1....1..0....4..5....3..5....1..1....4..2....3..0....2..1....2..5....2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 04 2013
STATUS
approved