OFFSET
1,1
COMMENTS
Column 5 of A207068.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (7/30)*n^5 + 7*n^4 + (21/2)*n^3 - (56/15)*n.
Conjectures from Colin Barker, Jun 18 2018: (Start)
G.f.: 14*x*(1 + 8*x - 5*x^2 - 2*x^3) / (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:
..0..1..1..1..0....0..0..0..0..0....1..1..0..0..0....1..0..1..1..0
..0..1..1..0..1....1..1..0..0..0....0..1..1..1..1....1..1..0..0..0
..0..0..0..0..0....1..1..0..0..0....0..1..1..0..1....0..0..0..0..0
..0..0..0..0..0....1..0..0..0..0....0..1..1..0..0....0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2012
STATUS
approved