OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 24*a(n-2) + 14*a(n-3) - 129*a(n-4) - 68*a(n-5) + 228*a(n-6) + 64*a(n-7) - 128*a(n-8).
Empirical g.f.: 4*x*(24 + 111*x - 78*x^2 - 725*x^3 - 96*x^4 + 1324*x^5 + 208*x^6 - 736*x^7) / (1 - 24*x^2 - 14*x^3 + 129*x^4 + 68*x^5 - 228*x^6 - 64*x^7 + 128*x^8). - Colin Barker, Oct 11 2018
EXAMPLE
Some solutions for n=5:
..4..2....1..3....2..4....4..2....4..3....3..4....0..0....2..4....3..2....4..2
..1..2....4..4....1..1....1..1....1..1....3..1....3..1....1..4....3..0....4..1
..1..4....3..1....2..4....4..3....3..0....3..4....3..0....3..3....1..1....4..3
..2..2....0..1....1..1....4..1....1..1....1..4....3..2....1..4....0..3....4..1
..4..1....3..1....0..3....2..1....0..3....1..3....0..0....3..3....0..1....3..1
..4..3....0..1....2..3....4..4....2..2....1..0....1..3....0..2....3..3....0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 2013
STATUS
approved