OFFSET
1,2
COMMENTS
Row 6 of A214943.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = n^6 + n^5 - 3*n^4 - 2*n^3 + 2*n^2 + n.
Conjectures from Colin Barker, Jul 22 2018: (Start)
G.f.: 6*x^2*(7 + 67*x + 45*x^2 + x^3) / (1 - x)^7.
a(n) = 7*a(n-1) - 21*a(n-2) + 35*a(n-3) - 35*a(n-4) + 21*a(n-5) - 7*a(n-6) + a(n-7) for n>7.
(End)
EXAMPLE
Some solutions for n=2:
..0....1....1....1....0....1....2....0....1....2....0....2....0....1....0....2
..2....0....0....2....1....0....1....2....2....1....1....1....1....2....2....0
..0....2....1....1....2....2....0....1....0....2....0....2....2....1....0....2
..1....1....2....0....0....1....1....0....2....0....2....0....1....0....1....1
..2....0....0....2....2....2....2....2....1....1....1....1....0....1....0....2
..1....1....1....1....1....0....0....0....0....0....0....2....1....2....2....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 30 2012
STATUS
approved