OFFSET
1,1
COMMENTS
Column 4 of A219410.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) + 57*a(n-2) + 96*a(n-3) + 27*a(n-4) - 11*a(n-5) - 4*a(n-6).
Empirical g.f.: x*(1 + 2*x)*(7 + 35*x + 44*x^2 - 2*x^3 - 6*x^4) / (1 - 7*x - 57*x^2 - 96*x^3 - 27*x^4 + 11*x^5 + 4*x^6). - Colin Barker, Jul 26 2018
EXAMPLE
Some solutions for n=3:
..1..1..1..1....1..0..1..1....1..1..0..0....1..0..0..0....1..0..0..0
..1..0..0..0....0..1..0..1....1..0..0..1....1..0..1..1....1..0..1..1
..1..0..0..0....1..0..1..1....1..0..1..1....0..0..0..1....0..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 19 2012
STATUS
approved