OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 13*a(n-1) - 5*a(n-2) - 47*a(n-3) + 52*a(n-4) - 12*a(n-5) for n>6.
Empirical g.f.: x*(10 - 56*x + 29*x^2 + 93*x^3 - 89*x^4 + 18*x^5) / ((1 - x)*(1 - 12*x - 7*x^2 + 40*x^3 - 12*x^4)). - Colin Barker, Oct 07 2018
EXAMPLE
Some solutions for n=4:
..0..1..1..1....0..1..0..1....0..1..1..3....0..1..3..1....0..0..0..0
..0..0..0..0....0..0..1..1....3..1..3..1....1..1..3..2....0..0..1..1
..1..0..0..2....0..1..1..3....1..3..1..3....3..1..3..3....1..1..1..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 04 2013
STATUS
approved