OFFSET
1,2
COMMENTS
Column 2 of A183892.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..62
FORMULA
Empirical (for n>=3): 3^(n+3) - 2*(n+4)^2. - Vaclav Kotesovec, Nov 27 2012
Conjectures from Colin Barker, Apr 05 2018: (Start)
G.f.: x*(1 + 115*x - 83*x^2 - 285*x^3 + 410*x^4 - 150*x^5) / ((1 - x)^3*(1 - 3*x)).
a(n) = 6*a(n-1) - 12*a(n-2) + 10*a(n-3) - 3*a(n-4) for n>6.
(End)
EXAMPLE
Some solutions for n=4:
..0....2....2....2....2....1....2....0....2....1....2....1....0....0....2....2
..0....1....0....2....2....2....0....1....1....2....1....2....1....2....2....1
..1....1....2....0....1....0....2....1....1....2....2....1....1....0....0....1
..2....0....1....0....1....1....2....1....2....1....0....0....2....2....2....1
..1....1....1....1....1....0....1....0....1....2....2....0....0....2....0....0
..2....1....0....1....1....1....2....2....1....1....2....1....0....2....2....1
..0....0....2....2....0....0....1....0....0....1....2....2....0....1....0....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 07 2011
STATUS
approved