OFFSET
1,1
COMMENTS
(2n-1,n) diagonal through A189895.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..71
FORMULA
Empirical: a(n) = 4*a(n-1) -5*a(n-2) +5*a(n-4) -4*a(n-5) +a(n-6).
Empirical: a(n) = -1/16 +11*n^4/8 +7*n^3/2 +3*n^2/4 -3*n/2 +(-1)^n/16 with g.f. -2*x*(2+17*x+14*x^2)/ ((1+x)*(x-1)^5). - R. J. Mathar, May 18 2011
EXAMPLE
Some solutions for n=2
..0..0....2..2....2..1....1..1....0..2....3..2....3..0....2..0....0..1....1..0
..0..1....2..1....2..2....0..0....0..0....2..2....2..0....1..1....1..0....0..2
..1..0....3..2....3..1....0..2....2..2....3..1....3..1....3..1....1..2....3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 30 2011
STATUS
approved