OFFSET
1,1
COMMENTS
Column 4 of A223838.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/3)*n^4 + (2/3)*n^3 + (31/6)*n^2 + (71/6)*n - 9 for n>1.
Conjectures from Colin Barker, Aug 23 2018: (Start)
G.f.: x*(11 - 9*x - 2*x^2 + 9*x^3 + x^4 - 2*x^5) / (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>6.
(End)
EXAMPLE
Some solutions for n=3:
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..1..1..0
..0..0..0..0....0..0..0..0....0..1..0..0....1..1..1..0....1..1..1..0
..0..1..1..0....0..1..1..1....0..1..1..0....1..1..1..0....1..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 27 2013
STATUS
approved