OFFSET
1,1
COMMENTS
Row 5 of A207254.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (4/15)*n^5 + (32/3)*n^4 + (44/3)*n^3 - (32/3)*n^2 + (16/15)*n.
Conjectures from Colin Barker, Jun 21 2018: (Start)
G.f.: 16*x*(1 + 10*x - 4*x^2 - 6*x^3 + x^4) / (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:
..1..0..0..0....0..1..1..0....0..1..0..0....0..1..1..0....1..1..1..1
..0..1..1..0....1..1..0..0....1..1..1..0....0..1..1..1....1..1..0..0
..0..1..1..1....1..0..0..0....1..1..1..1....1..1..1..1....0..0..0..0
..1..1..1..1....0..0..0..0....0..1..1..1....1..0..0..0....0..0..0..0
..1..1..0..0....0..0..0..0....0..0..0..0....1..0..0..0....1..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 16 2012
STATUS
approved