OFFSET
1,1
COMMENTS
Row 3 of A195232.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 91*n - 27.
Conjectures from Colin Barker, May 06 2018: (Start)
G.f.: x*(64 + 27*x) / (1 - x)^2.
a(n) = 2*a(n-1) - a(n-2) for n>2.
(End)
EXAMPLE
Some solutions for n=4:
..2......1......0......2......1......3......2......0......4......3......0
..2.3....2.1....0.1....1.1....0.0....2.2....2.1....0.1....3.3....4.3....0.0
..2.3.3..1.1.2..0.1.1..2.2.1..0.0.0..2.2.1..2.1.1..1.0.0..3.4.4..3.3.4..0.1.1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 13 2011
STATUS
approved