OFFSET
1,1
COMMENTS
Row 6 of A224038.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/720)*n^6 + (1/240)*n^5 + (35/144)*n^4 + (127/48)*n^3 + (1249/45)*n^2 + (3727/20)*n + 6 for n>4.
Conjectures from Colin Barker, Aug 26 2018: (Start)
G.f.: x*(64 - 71*x - 447*x^2 + 1163*x^3 - 952*x^4 + 97*x^5 + 216*x^6 - 72*x^7 + 33*x^8 - 45*x^9 + 15*x^10) / (1 - x)^7.
a(n) = 7*a(n-1) - 21*a(n-2) + 35*a(n-3) - 35*a(n-4) + 21*a(n-5) - 7*a(n-6) + a(n-7) for n>11.
(End)
EXAMPLE
Some solutions for n=3:
..0..0..0....1..1..1....1..1..1....0..0..0....0..0..0....0..0..0....1..1..1
..0..0..1....0..1..1....1..1..1....1..1..1....0..0..0....0..0..0....0..1..1
..0..0..0....0..1..1....0..1..1....1..1..1....0..0..0....0..0..0....0..0..1
..0..0..1....0..1..1....0..1..1....0..1..1....0..0..0....0..0..1....0..0..1
..0..0..0....1..1..1....0..1..1....1..1..1....0..0..1....0..1..1....0..0..0
..0..1..1....1..1..1....1..1..1....0..1..1....0..1..1....1..1..1....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2013
STATUS
approved