OFFSET
1,2
COMMENTS
Row 2 of A221852.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..37
FORMULA
Empirical: a(n) = 13*a(n-1) - 14*a(n-2) - 113*a(n-3) + 189*a(n-4) - 10*a(n-5) - 42*a(n-6) + 18*a(n-7) - 2*a(n-8).
Empirical g.f.: x*(1 + 18*x - 87*x^2 + 58*x^3 + 16*x^4 - 8*x^5 - 2*x^6) / (1 - 13*x + 14*x^2 + 113*x^3 - 189*x^4 + 10*x^5 + 42*x^6 - 18*x^7 + 2*x^8). - Colin Barker, Aug 11 2018
EXAMPLE
Some solutions for n=3:
..3..2..1....2..0..2....0..2..1....0..0..1....2..0..0....2..1..1....0..2..0
..0..0..0....1..0..1....0..3..0....1..2..2....1..3..0....0..0..2....3..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 27 2013
STATUS
approved