OFFSET
1,1
COMMENTS
Column 2 of A251219
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) +4*a(n-2) -12*a(n-3) +4*a(n-5).
Empirical: G.f.: -x*(21-82*x^2+16*x^3+32*x^4) / ( -1+3*x+4*x^2-12*x^3+4*x^5 ). - R. J. Mathar, May 12 2016
EXAMPLE
Some solutions for n=4
..0..1..1....0..1..1....1..0..1....0..1..0....0..0..0....1..1..1....1..1..1
..1..1..0....1..1..1....1..1..1....0..0..0....1..0..1....1..1..0....0..1..0
..1..1..1....0..1..0....0..1..1....1..0..1....1..1..1....1..1..1....1..1..1
..1..1..1....1..1..1....0..0..1....1..1..1....1..1..0....1..1..1....1..1..1
..1..1..1....1..0..1....0..1..1....1..1..0....0..1..1....1..1..1....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 30 2014
STATUS
approved