OFFSET
1,1
COMMENTS
Column 3 of A202461.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/20)*n^5 + 2*n^4 + (275/12)*n^3 + 113*n^2 + (10351/30)*n + 517.
Conjectures from Colin Barker, May 31 2018: (Start)
G.f.: x*(1000 - 4124*x + 7106*x^2 - 6297*x^3 + 2838*x^4 - 517*x^5) / (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:
..0..0..0..0..0....0..0..0..1..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..1..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..1..0....0..0..0..0..1....0..0..0..0..0
..0..0..0..0..1....0..1..1..1..1....0..0..1..1..1....0..0..1..0..1
..0..0..1..0..0....1..1..1..1..1....0..0..1..0..1....0..0..0..1..1
..0..0..0..0..0....0..1..1..1..1....0..0..0..0..1....0..1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2011
STATUS
approved