OFFSET
1,1
COMMENTS
Row 4 of A184703.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = a(n-1) + a(n-2) - 2*a(n-5) + a(n-8) + a(n-9) - a(n-10).
Empirical g.f.: x*(2 + 5*x + 5*x^2 + 7*x^3 + 4*x^4 + 4*x^5 + x^6 + x^7 + x^8 - x^9) / ((1 - x)^4*(1 + x)^2*(1 + x^2)*(1 + x + x^2)). - Colin Barker, Apr 14 2018
EXAMPLE
All solutions for n=3:
..0....3....3....1....2....2....2....2....1....1....3....0....0....0
..1....0....3....0....1....3....0....2....2....1....1....2....0....3
..2....3....1....1....0....0....2....2....1....3....1....0....0....2
..1....0....0....2....2....1....1....0....1....0....1....2....3....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 20 2011
STATUS
approved