OFFSET
1,1
COMMENTS
Row 5 of A224133.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (2/15)*n^5 + (7/6)*n^4 + (47/6)*n^3 + (173/6)*n^2 + (1981/30)*n - 27 for n>3.
Conjectures from Colin Barker, Aug 27 2018: (Start)
G.f.: x*(32 + 51*x - 230*x^2 + 152*x^3 + 179*x^4 - 228*x^5 + 18*x^6 + 63*x^7 - 21*x^8) / (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>9.
(End)
EXAMPLE
Some solutions for n=3:
..0..0..1....0..0..0....1..1..1....1..1..1....0..0..1....0..0..1....0..1..1
..0..0..0....0..1..1....0..0..1....0..1..1....0..1..1....0..0..1....1..1..1
..0..0..0....0..0..1....0..1..1....0..1..1....1..1..1....0..1..1....0..1..1
..1..1..1....0..0..1....1..1..1....0..1..1....0..0..0....0..0..0....1..1..1
..0..0..1....0..0..0....0..0..1....1..1..1....0..0..1....0..0..1....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 31 2013
STATUS
approved