OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 48*a(n-1) - 448*a(n-2) + 1024*a(n-3) for n>5.
Empirical g.f.: x*(11 - 392*x + 3072*x^2 - 8192*x^3 + 16384*x^4) / ((1 - 8*x)*(1 - 40*x + 128*x^2)). - Colin Barker, Oct 11 2018
EXAMPLE
Some solutions for n=3:
..0..1..5....0..1..5....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..5..2..5....5..2..0....3..1..3....0..4..5....2..5..3....3..1..5....5..1..2
..1..3..5....4..2..0....5..1..2....0..2..4....1..0..2....5..4..3....5..4..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 06 2013
STATUS
approved