OFFSET
1,1
COMMENTS
Column 4 of A223423.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 14*a(n-1) - 36*a(n-2) - 40*a(n-3) + 88*a(n-4) + 32*a(n-5) - 32*a(n-6).
Empirical g.f.: 16*x*(3 - 13*x - 3*x^2 + 26*x^3 + 4*x^4 - 8*x^5) / (1 - 14*x + 36*x^2 + 40*x^3 - 88*x^4 - 32*x^5 + 32*x^6). - Colin Barker, Aug 20 2018
EXAMPLE
Some solutions for n=3:
..0..2..0..2....5..2..0..1....3..1..0..1....1..3..1..3....3..1..0..2
..1..0..1..0....2..0..1..0....1..0..1..0....0..1..4..1....1..0..1..0
..4..1..4..1....6..2..0..2....0..1..0..2....1..0..1..4....3..1..4..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 20 2013
STATUS
approved