OFFSET
1,1
COMMENTS
Row 3 of A194931.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 171*n - 127 for n>2.
Empirical g.f.: x*(64 + 89*x + 16*x^2 + 2*x^3) / (1 - x)^2. - Colin Barker, May 05 2018
EXAMPLE
Some solutions for n=4:
..1......0......3......3......1......0......1......3......1......4......3
..2.2....1.2....3.2....3.4....1.1....1.2....0.1....4.3....1.2....3.4....2.2
..3.2.2..2.3.4..2.3.3..3.4.3..2.1.0..1.1.2..0.0.1..4.3.4..0.1.1..2.3.2..3.2.2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 05 2011
STATUS
approved