OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) - 13*a(n-2) + 10*a(n-3) + 5*a(n-4) - 14*a(n-5) + 9*a(n-6) - 2*a(n-7) for n>9.
Conjectures from Colin Barker, Nov 26 2018: (Start)
G.f.: x*(133 - 382*x + 235*x^2 + 330*x^3 - 597*x^4 + 264*x^5 + 27*x^6 - 26*x^7 - 4*x^8) / ((1 - x)^5*(1 + x)*(1 - 2*x)).
a(n) = (-873 + 49*(-1)^n + 841*2^(1+n) - 614*n - 11*n^2 + 38*n^3 + 5*n^4) / 12 for n>2.
(End)
EXAMPLE
Some solutions for n=4:
..1..1..1....0..0..2....0..1..2....0..0..2....0..0..1....0..0..2....0..1..2
..0..0..0....1..0..2....1..0..0....2..0..2....0..0..1....0..0..0....0..0..0
..1..1..1....2..0..2....1..0..0....2..0..2....1..1..1....0..0..0....1..0..0
..1..0..0....2..0..2....2..0..0....2..0..1....0..0..0....0..0..0....1..0..0
..2..0..0....2..0..1....2..0..0....2..0..0....0..0..0....2..1..1....1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 30 2014
STATUS
approved