OFFSET
1,1
COMMENTS
Row 4 of A194931.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 6939*n - 8379 for n>4.
Empirical g.f.: x*(1024 + 3825*x + 1752*x^2 + 304*x^3 + 32*x^4 + 2*x^5) / (1 - x)^2. - Colin Barker, May 05 2018
EXAMPLE
Some solutions for n=4:
..2........0........1........1........2........2........0........2
..1.2......0.1......0.0......2.3......1.2......1.0......0.0......2.1
..2.3.4....0.1.1....1.1.1....3.3.3....1.2.2....0.0.1....1.0.1....2.2.2
..3.3.3.4..0.0.1.1..0.1.1.2..3.2.2.2..0.1.2.1..0.1.2.2..1.0.0.0..2.2.2.3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 05 2011
STATUS
approved