OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 512*a(n-1) - 33792*a(n-2) + 589824*a(n-3).
Empirical g.f.: 4*x*(9 - 1120*x + 30720*x^2) / ((1 - 32*x)*(1 - 480*x + 18432*x^2)). - Colin Barker, Oct 11 2018
EXAMPLE
Some solutions for n=2:
..0..1..2..4..3....0..1..2..5..3....0..1..2..1..0....0..1..2..4..2
..5..4..3..5..2....2..1..2..0..1....2..1..0..3..0....2..4..0..1..5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 06 2013
STATUS
approved