OFFSET
1,1
COMMENTS
Column 7 of A224665
FORMULA
Empirical: a(n) = 6*a(n-1) -12*a(n-2) +5*a(n-3) +12*a(n-4) -12*a(n-5) -3*a(n-6) +6*a(n-7) -a(n-9) for n>10
Empirical g.f.: 8*x -2*x^2 *(-16 -4*x +249*x^2 -516*x^3 +238*x^4 +241*x^5 -199*x^6 -31*x^7 +35*x^8) /(x-1)^3 /(x^2+x-1)^3 . - R. J. Mathar, Nov 09 2018
EXAMPLE
Some solutions for n=3
..1..0..0....1..0..4....1..1..6....1..1..5....1..0..0....1..0..6....1..1..2
..1..0..0....0..0..1....0..0..0....0..0..0....1..0..1....1..0..1....0..0..0
..4..0..0....0..0..1....0..1..1....0..0..1....1..0..1....2..0..1....7..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 14 2013
STATUS
approved