OFFSET
1,1
COMMENTS
Column 4 of A208269.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 10*a(n-1) + 20*a(n-2) - 21*a(n-3) - 30*a(n-4) + 8*a(n-5).
Empirical g.f.: x*(8 + 9*x - 17*x^2 - 13*x^3 + 4*x^4) / (1 - 10*x - 20*x^2 + 21*x^3 + 30*x^4 - 8*x^5). - Colin Barker, Jun 29 2018
EXAMPLE
Some solutions for n=4:
..0..1..1..1....0..0..0..1....0..1..0..1....0..0..0..1....0..0..1..0
..1..1..0..0....0..1..1..0....1..1..0..1....1..0..1..0....0..1..1..0
..0..0..1..1....1..1..0..1....0..1..1..0....1..1..1..1....1..1..0..0
..1..1..0..0....0..0..1..0....0..0..1..1....1..0..1..0....1..0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 24 2012
STATUS
approved