OFFSET
1,1
COMMENTS
Row 6 of A224133.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (2/45)*n^6 + (8/15)*n^5 + (181/36)*n^4 + 28*n^3 + (19247/180)*n^2 + (3952/15)*n - 120 for n>4.
Conjectures from Colin Barker, Aug 27 2018: (Start)
G.f.: x*(64 + 281*x - 1067*x^2 + 617*x^3 + 1387*x^4 - 1840*x^5 + 160*x^6 + 696*x^7 - 172*x^8 - 154*x^9 + 60*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..1....0..0..1....0..1..1....0..0..1....0..0..0....0..0..0....0..0..1
..1..1..1....0..1..1....0..0..1....0..0..0....0..0..0....0..1..1....0..1..1
..0..1..1....1..1..1....0..0..1....0..0..1....0..1..1....0..0..1....0..1..1
..0..1..1....0..0..1....0..1..1....0..0..0....1..1..1....0..0..0....1..1..1
..1..1..1....0..1..1....0..0..1....0..0..1....1..1..1....0..0..1....1..1..1
..0..0..0....0..1..1....0..0..1....0..0..0....0..0..1....0..0..1....0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 31 2013
STATUS
approved