OFFSET
1,1
COMMENTS
Column 6 of A189326.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 6*n^2 + 34*n - 264 for n>8.
Empirical g.f.: x*(10 - 12*x + 12*x^2 + 8*x^4 + 5*x^5 + 4*x^6 - 5*x^7 - 5*x^8 - 4*x^9 - x^10) / (1 - x)^3. - Colin Barker, May 02 2018
EXAMPLE
Some solutions for n=3:
..1....1....2....2....1....3....1....2....2....0....1....1....3....2....1....1
..5....6....3....4....4....6....5....2....4....3....3....3....3....3....5....3
..5....6....3....4....5....6....5....4....4....3....4....3....3....3....6....3
..5....6....6....4....5....6....6....6....6....3....5....4....6....3....6....6
..6....6....6....6....6....6....6....6....6....6....6....6....6....6....6....6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 20 2011
STATUS
approved