OFFSET
1,1
COMMENTS
Column 4 of A224190.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (41/4032)*n^8 + (55/336)*n^7 + (179/160)*n^6 + (169/40)*n^5 + (615/64)*n^4 + (215/16)*n^3 + (56759/5040)*n^2 + (2173/420)*n + 1.
Conjectures from Colin Barker, Aug 29 2018: (Start)
G.f.: x*(46 + 134*x + 250*x^2 - 91*x^3 + 127*x^4 - 84*x^5 + 36*x^6 - 9*x^7 + x^8) / (1 - x)^9.
a(n) = 9*a(n-1) - 36*a(n-2) + 84*a(n-3) - 126*a(n-4) + 126*a(n-5) - 84*a(n-6) + 36*a(n-7) - 9*a(n-8) + a(n-9) for n>9.
(End)
EXAMPLE
Some solutions for n=3:
..0..1..0..0....1..1..1..1....2..1..0..0....0..1..2..0....0..1..0..0
..1..1..0..0....1..1..1..1....2..1..1..0....0..2..2..0....0..1..1..0
..1..2..0..0....1..1..1..1....2..2..1..1....0..2..2..0....1..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 01 2013
STATUS
approved