OFFSET
1,1
COMMENTS
Column 5 of A207391.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (2/15)*n^5 + (55/12)*n^4 + (101/6)*n^3 + (5/12)*n^2 - (299/30)*n + 2.
Conjectures from Colin Barker, Jun 22 2018: (Start)
G.f.: 2*x*(7 + 56*x - 66*x^2 + 6*x^3 + 6*x^4 - x^5) / (1 - x)^6.
a(n) = 6*a(n-1) - 15*a(n-2) + 20*a(n-3) - 15*a(n-4) + 6*a(n-5) - a(n-6) for n>6.
(End)
EXAMPLE
Some solutions for n=4:
..1..0..1..1..0....0..0..0..0..0....1..0..0..0..0....0..1..1..1..0
..1..1..1..0..0....0..1..1..1..1....0..1..1..0..1....1..1..0..1..1
..1..1..1..1..0....0..1..1..0..0....1..1..1..0..1....1..1..1..1..0
..1..1..1..1..0....0..1..1..1..1....1..1..1..0..1....1..1..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 17 2012
STATUS
approved