OFFSET
1,2
COMMENTS
Row 7 of A221524.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 1*n^7 + 1*n^6 - 29*n^5 + 109*n^4 - 204*n^3 + 202*n^2 - 80*n for n>2.
Conjectures from Colin Barker, Aug 06 2018: (Start)
G.f.: 8*x^2*(2 + 80*x + 356*x^2 + 332*x^3 - 97*x^4 - 22*x^5 - 28*x^6 + 8*x^7 - x^8) / (1 - x)^8.
a(n) = 8*a(n-1) - 28*a(n-2) + 56*a(n-3) - 70*a(n-4) + 56*a(n-5) - 28*a(n-6) + 8*a(n-7) - a(n-8) for n>10.
(End)
EXAMPLE
Some solutions for n=6:
..4....3....4....4....0....0....3....3....3....1....4....3....3....3....4....0
..1....5....1....6....4....5....1....0....1....3....2....6....0....0....0....6
..1....1....6....1....5....1....6....3....0....3....1....4....6....5....0....4
..3....5....3....0....0....6....5....0....6....5....4....2....0....3....2....6
..6....2....2....5....5....0....1....2....3....0....0....1....2....5....6....3
..0....0....4....2....3....6....5....3....1....4....0....6....2....0....1....2
..4....5....6....5....0....2....3....1....4....1....6....2....5....5....3....4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 19 2013
STATUS
approved