OFFSET
1,1
COMMENTS
Column 5 of A208118.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 4*a(n-2) - 10*a(n-3) - 5*a(n-4) + 20*a(n-5) - 20*a(n-7) + 5*a(n-8) + 10*a(n-9) - 4*a(n-10) - 2*a(n-11) + a(n-12).
Empirical g.f.: x*(15 + 195*x + 315*x^2 + 625*x^3 + 290*x^4 + 34*x^5 - 50*x^6 + 14*x^7 + 7*x^8 - 5*x^9 - x^10 + x^11) / ((1 - x)^7*(1 + x)^5). - Colin Barker, Jun 28 2018
EXAMPLE
Some solutions for n=4:
..1..0..0..1..1....0..0..1..1..0....0..0..1..1..1....1..0..1..1..0
..0..1..1..1..0....1..1..0..1..1....0..1..1..1..1....1..0..1..1..1
..1..0..0..1..1....0..0..1..1..0....0..0..1..1..1....0..0..1..1..0
..0..0..1..1..0....1..0..0..1..1....0..0..1..1..1....0..0..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 23 2012
STATUS
approved