OFFSET
1,1
COMMENTS
Column 6 of A207169.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (19/4)*n^4 + (95/2)*n^3 - (57/4)*n^2 - 19*n.
Conjectures from Colin Barker, Jun 20 2018: (Start)
G.f.: 19*x*(1 + 14*x - 7*x^2 - 2*x^3) / (1 - x)^5.
a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n>5.
(End)
EXAMPLE
Some solutions for n=4:
..1..1..1..1..0..0....1..0..0..1..0..0....1..0..0..1..0..0....1..0..0..1..0..0
..0..0..1..0..0..1....0..1..1..0..0..1....1..1..1..0..0..1....0..1..1..0..0..1
..0..0..1..0..0..1....0..0..1..0..0..1....0..0..1..0..0..1....0..1..1..0..0..1
..0..0..1..0..0..1....0..0..1..0..0..1....0..0..1..0..0..1....0..0..1..0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 15 2012
STATUS
approved