OFFSET
1,1
COMMENTS
Row 3 of A223556.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 17*a(n-1) - 47*a(n-2) + 41*a(n-3) - 10*a(n-4) for n>6.
Empirical g.f.: 9*x*(4 - 41*x + 90*x^2 - 119*x^3 + 80*x^4 - 18*x^5) / ((1 - x)*(1 - 16*x + 31*x^2 - 10*x^3)). - Colin Barker, Aug 21 2018
EXAMPLE
Some solutions for n=3:
..0..2..0....0..3..0....0..1..4....0..3..4....0..3..5....0..1..2....0..1..0
..5..2..5....5..2..1....2..5..3....0..3..4....5..4..3....2..5..4....4..3..5
..5..3..5....5..4..3....4..5..2....0..3..4....3..0..3....2..1..4....0..3..4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 22 2013
STATUS
approved