OFFSET
1,1
COMMENTS
Column 2 of A210404.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 28*a(n-1) - 123*a(n-2) - 20*a(n-3) + 500*a(n-4) - 384*a(n-5).
Empirical g.f.: x*(59 - 336*x + 56*x^2 + 1400*x^3 - 1344*x^4) / ((1 - x)*(1 + 2*x)*(1 - 29*x + 154*x^2 - 192*x^3)). - Colin Barker, Jul 15 2018
EXAMPLE
Some solutions for n=4:
..0..0..0....0..0..0....0..1..1....0..1..0....0..0..0....0..1..1....0..0..0
..0..0..0....0..0..0....0..2..3....0..2..0....0..0..0....2..1..1....1..2..1
..1..2..1....0..0..0....1..1..1....0..1..0....0..0..0....3..1..1....1..3..2
..0..1..3....1..2..3....3..2..3....0..2..1....0..0..0....2..1..1....0..3..0
..1..3..0....0..1..1....3..0..0....3..3..1....1..2..3....1..3..0....0..1..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 21 2012
STATUS
approved