OFFSET
1,2
COMMENTS
Row 2 of A221125.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..88
FORMULA
Empirical: a(n) = 11*a(n-1) - 11*a(n-2) - 12*a(n-3) - 2*a(n-4) for n>6.
Empirical g.f.: x*(1 + 10*x - 20*x^2 - 7*x^3 + 9*x^4 + x^5) / (1 - 11*x + 11*x^2 + 12*x^3 + 2*x^4). - Colin Barker, Aug 04 2018
EXAMPLE
Some solutions for n=3:
..0..1..0....1..0..2....1..2..0....1..2..0....0..3..1....1..1..1....0..1..0
..2..3..0....0..1..2....2..0..1....1..2..0....0..0..2....1..0..2....2..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 02 2013
STATUS
approved