OFFSET
1,1
COMMENTS
Row 6 of A220032.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..155
FORMULA
Empirical: a(n) = (1/120)*n^5 - (1/12)*n^4 + (47/24)*n^3 - (23/12)*n^2 + (1771/30)*n - 323 for n>8.
Conjectures from Colin Barker, Jul 30 2018: (Start)
G.f.: x*(7 - 30*x + 61*x^2 - 45*x^3 - 26*x^4 + 59*x^5 - 35*x^6 + 3*x^7 + 24*x^8 - 21*x^9 + 3*x^10 + x^11 - x^12 + x^13) / (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>14.
(End)
EXAMPLE
Some solutions for n=3:
..1..0..0....0..0..0....0..0..0....0..0..0....1..0..0....0..0..0....0..0..0
..1..0..0....0..0..0....0..0..0....1..0..0....1..1..1....1..0..0....0..0..0
..1..0..0....1..0..0....0..0..0....1..1..1....1..1..1....1..0..0....0..0..0
..1..0..0....1..0..0....1..1..0....1..1..1....1..1..1....1..1..1....1..0..0
..1..0..0....1..1..1....1..1..1....1..1..1....1..1..1....1..1..1....1..0..0
..1..1..1....1..1..1....1..1..1....1..1..1....1..1..1....1..1..1....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 03 2012
STATUS
approved