OFFSET
1,1
COMMENTS
Column 4 of A189326.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = n^2 + 11*n - 32 for n>5.
Empirical g.f.: x*(7 - 9*x + 5*x^2 + x^3 + x^4 - x^5 - x^6 - x^7) / (1 - x)^3. - Colin Barker, May 02 2018
EXAMPLE
Some solutions for n=3:
..1....1....3....0....1....2....1....1....1....4....1....0....1....1....2....1
..3....2....4....4....3....2....3....1....2....4....2....2....2....1....2....4
..4....2....4....4....3....4....3....2....3....4....3....2....2....2....2....4
..4....2....4....4....4....4....3....2....3....4....4....2....3....3....2....4
..4....4....4....4....4....4....4....4....4....4....4....4....4....4....4....4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 20 2011
STATUS
approved