OFFSET
1,1
COMMENTS
Column 3 of A202202.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*(n+5)*(n+4)*(n+3)*(n+2)^2/12.
Conjectures from Colin Barker, May 27 2018: (Start)
G.f.: 10*x*(45 - 130*x + 185*x^2 - 144*x^3 + 59*x^4 - 10*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:
..1..1..1..0..0....1..1..1..0..0....0..0..0..0..0....0..1..0..0..0
..1..1..1..1..1....1..1..1..1..1....1..1..1..1..1....1..1..1..1..0
..1..1..1..1..1....1..1..1..1..1....1..1..1..1..1....0..1..1..0..0
..0..1..0..0..0....0..1..1..1..1....0..1..1..0..0....0..1..1..0..0
..0..1..0..0..0....0..1..1..1..1....0..0..0..0..0....0..1..1..0..0
..0..0..0..0..0....0..1..1..1..0....0..0..0..0..0....0..1..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2011
STATUS
approved