OFFSET
1,1
COMMENTS
Column 7 of A207169.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 35*n^4 + 42*n^3 + 7*n^2 - 84*n + 28.
Conjectures from Colin Barker, Jun 20 2018: (Start)
G.f.: 28*x*(1 + 23*x + 6*x^2 - x^3 + x^4) / (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:
..0..1..0..0..1..1..0....1..0..0..1..0..0..1....0..0..1..0..0..1..1
..1..1..0..0..1..1..1....0..1..1..1..1..1..1....0..1..1..1..1..1..0
..1..1..0..0..1..1..1....0..1..1..1..0..0..1....0..0..1..0..0..1..0
..0..1..0..0..1..0..0....0..0..1..1..0..0..1....0..0..1..0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 15 2012
STATUS
approved