OFFSET
1,1
COMMENTS
Column 6 of A204642.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) -3*a(n-2) -4*a(n-3) -12*a(n-4) +12*a(n-5) +21*a(n-6) -9*a(n-7) -9*a(n-8) for n>10.
Empirical g.f.: x*(65096 - 323241*x + 186610*x^2 + 258882*x^3 + 778906*x^4 - 741057*x^5 - 1348044*x^6 + 540753*x^7 + 561771*x^8 + 504*x^9) / ((1 - x)*(1 - x - x^2)*(1 - 3*x - 3*x^2)*(1 - 3*x^3)). - Colin Barker, Jun 08 2018
EXAMPLE
Some solutions for n=3:
..0..1..0..0..1..1..0..1....0..1..1..0..2..0..2..1....0..0..0..0..0..0..0..0
..0..1..0..0..1..1..0..1....0..1..1..0..2..0..2..1....0..0..0..0..0..0..0..0
..0..1..0..0..1..1..0..1....0..1..1..0..2..0..2..1....1..1..1..1..1..1..1..1
..0..1..0..0..1..1..0..1....0..1..1..0..2..0..2..1....2..2..2..2..2..2..2..2
..0..1..0..0..1..1..0..1....0..1..1..0..2..0..2..1....0..0..0..0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 17 2012
STATUS
approved