OFFSET
1,1
COMMENTS
Row 5 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) - a(n-5) - a(n-6) - a(n-7) + a(n-8) + a(n-9) + a(n-10) - a(n-13) - a(n-14) + a(n-15).
Empirical g.f.: x*(3 + 9*x + 19*x^2 + 32*x^3 + 44*x^4 + 51*x^5 + 48*x^6 + 40*x^7 + 25*x^8 + 13*x^9 + 4*x^10 + x^11 - x^12 - x^13 + x^14) / ((1 - x)^5*(1 + x)^2*(1 + x^2)*(1 + x + x^2)*(1 + x + x^2 + x^3 + x^4)). - Colin Barker, Apr 14 2018
EXAMPLE
Some solutions for n=3:
..0....0....3....1....2....2....2....3....0....0....1....2....1....2....2....1
..1....2....1....1....2....1....0....0....2....0....2....0....2....0....2....0
..1....1....2....1....3....1....3....1....2....2....2....1....0....0....0....2
..0....2....1....1....0....2....1....1....0....1....1....0....0....2....1....2
..2....0....0....1....0....0....0....1....1....1....0....2....2....1....1....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 20 2011
STATUS
approved