OFFSET
1,1
COMMENTS
Column 2 of A202939.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/5)*n^5 + (31/2)*n^4 + (781/3)*n^3 + 2874*n^2 + (589559/30)*n + 60719.
Conjectures from Colin Barker, Jun 02 2018: (Start)
G.f.: x*(83521 - 387270*x + 723553*x^2 - 679679*x^3 + 320618*x^4 - 60719*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=3:
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..1..1..1..0....1..1..1..1..1....0..1..1..0..1....0..1..0..1..0
..0..1..0..0..0....0..1..0..0..1....0..0..1..0..1....0..1..1..0..1
..1..1..1..1..1....0..0..0..1..0....0..0..1..0..1....0..0..0..0..0
..0..1..0..1..0....0..0..1..1..0....0..0..1..1..0....0..1..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 26 2011
STATUS
approved