OFFSET
1,1
COMMENTS
Column 3 of A223352.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 91*a(n-2) - 192*a(n-4) + 64*a(n-6).
Empirical g.f.: 4*x*(7 + 59*x - 67*x^2 - 160*x^3 + 40*x^4 + 64*x^5) / (1 - 91*x^2 + 192*x^4 - 64*x^6). - Colin Barker, Aug 19 2018
EXAMPLE
Some solutions for n=3:
..1..4..1....1..4..2....2..0..2....0..2..4....5..2..0....4..1..0....4..2..5
..0..2..4....0..2..0....4..1..0....1..4..1....2..5..2....1..4..1....2..5..2
..1..0..1....2..4..1....2..4..1....0..1..3....0..2..4....4..1..0....4..2..5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 19 2013
STATUS
approved