OFFSET
1,1
COMMENTS
Row 6 of A204213.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (44/15)*n^5 + (133/12)*n^4 + 17*n^3 + (161/12)*n^2 + (167/30)*n + 1.
Conjectures from Colin Barker, Jun 06 2018: (Start)
G.f.: x*(51 + 167*x + 135*x^2 - 6*x^3 + 6*x^4 - x^5) / (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=5:
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..3....1....3....3....5....5....4....2....4....4....4....0....4....1....0....3
..5....6....5....4....6....5....2....3....3....8....9....0....3....3....1....5
..4....4....3....3....6....7....4....6....5....7....7....3....6....4....5....5
..5....5....7....2....8....7....4....1....4....4....6....1....5....0....0....2
..3....1....5....0....3....5....0....1....0....0....4....5....2....2....3....1
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2012
STATUS
approved