OFFSET
1,1
COMMENTS
Column 5 of A223556.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 95*a(n-1) - 626*a(n-2) + 720*a(n-3) for n>4.
Empirical g.f.: 9*x*(9 - 84*x + 90*x^2 + 116*x^3) / (1 - 95*x + 626*x^2 - 720*x^3). - Colin Barker, Aug 21 2018
EXAMPLE
Some solutions for n=3:
..0..2..5..3..0....0..1..0..1..4....0..2..1..4..5....0..2..0..3..0
..0..2..5..2..1....0..1..2..5..3....0..2..1..4..1....0..2..0..2..5
..1..4..1..2..1....2..1..2..0..1....1..4..1..2..0....1..2..1..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 22 2013
STATUS
approved