OFFSET
1,1
COMMENTS
Row 6 of A221463.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..136
FORMULA
Empirical: a(n) = 1*n^5 + 3*n^4 + 1*n^3.
Conjectures from Colin Barker, Aug 05 2018: (Start)
G.f.: x*(5 + 58*x + 60*x^2 - 2*x^3 - x^4) / (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=6:
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..4....1....4....1....2....6....5....3....4....3....6....2....2....4....5....5
..6....1....2....0....0....5....3....5....6....3....5....6....3....5....4....1
..5....3....4....0....2....3....4....0....4....2....4....2....1....0....1....6
..4....1....4....6....6....1....1....0....5....2....1....5....6....5....5....6
..2....0....3....2....1....3....3....6....0....0....0....1....1....1....2....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 17 2013
STATUS
approved