OFFSET
1,1
COMMENTS
Row 5 of A245134
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +2*a(n-2) -6*a(n-3) +6*a(n-5) -2*a(n-6) -2*a(n-7) +a(n-8).
Empirical: G.f.: -x*(8+23*x+18*x^2+21*x^3+12*x^4-x^5-2*x^6+x^7) / ( (1+x)^3*(x-1)^5 ). - R. J. Mathar, Jul 12 2014
EXAMPLE
Some solutions for n=10
..8....8....5....6....6....7....5....1....9....5....7....4....4....0....7....4
..0....0....6....3....5....6....6....6....0....2....1....7...10....6....1....8
..3....6....2....7....3....4....6....6...10....2....7....9....0....0....4....0
..6....0...10....1....9....6....4....8....0...10....3....7....2....0....3....0
..5....8....3....7....4....7....6....0....9....1....6....4....8....3....6....8
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 12 2014
STATUS
approved