OFFSET
1,1
COMMENTS
Row 3 of A190041.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = -2*a(n-1) -2*a(n-2) +3*a(n-4) +4*a(n-5) +3*a(n-6) -2*a(n-8) -2*a(n-9) -a(n-10).
Empirical g.f.: x*(2 + 12*x + 30*x^2 + 54*x^3 + 66*x^4 + 66*x^5 + 46*x^6 + 26*x^7 + 9*x^8 + 3*x^9) / ((1 - x)^2*(1 + x)^2*(1 + x^2)*(1 + x + x^2)^2). - Colin Barker, May 04 2018
EXAMPLE
All solutions for n=3:
..1....1....1....3....0....1....1....0....2....1
..1....1....3....3....3....2....2....1....3....1
..1....2....3....3....3....3....2....1....3....2
..2....2....3....3....3....3....3....2....3....3
..3....3....3....3....3....3....3....3....3....3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2011
STATUS
approved