OFFSET
1,1
COMMENTS
Column 5 of A201375.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/45)*n^6 - (1/60)*n^5 - (4/9)*n^4 + (11/4)*n^3 - (206/45)*n^2 + (64/15)*n.
Conjectures from Colin Barker, May 22 2018: (Start)
G.f.: 2*x*(1 - 4*x + 11*x^2 - 9*x^3 + 15*x^4 - 6*x^5) / (1 - x)^7.
a(n) = 7*a(n-1) - 21*a(n-2) + 35*a(n-3) - 35*a(n-4) + 21*a(n-5) - 7*a(n-6) + a(n-7) for n>7.
(End)
EXAMPLE
Some solutions for n=6:
..0..1..1..1..1....0..0..0..1..1....0..0..0..1..1....0..0..0..1..1
..0..1..1..1..1....0..0..1..0..1....0..0..1..0..1....0..0..0..1..1
..0..1..1..1..1....0..1..1..1..0....0..1..0..1..0....0..1..1..0..1
..1..0..1..1..1....1..0..1..0..0....0..1..1..0..0....0..1..1..1..0
..1..1..0..0..1....1..1..0..0..0....0..1..1..0..0....1..0..1..1..0
..1..1..1..1..0....1..1..0..0..0....1..0..0..0..0....1..1..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 30 2011
STATUS
approved