OFFSET
1,2
COMMENTS
Row 5 of A214943.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = n^5 + n^4 - 2*n^3 - n^2 + n.
Conjectures from Colin Barker, Jul 22 2018: (Start)
G.f.: 6*x^2*(5 + 14*x + x^2) / (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=2:
..1....2....2....0....1....0....0....0....2....1....2....2....0....2....1....2
..2....1....1....1....0....1....2....2....1....0....0....0....1....1....2....0
..0....0....2....2....2....2....1....0....0....2....1....1....0....2....0....2
..2....2....0....0....1....0....0....1....1....0....2....2....2....0....1....1
..1....1....2....2....2....1....2....0....2....1....0....1....0....1....0....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 30 2012
STATUS
approved