OFFSET
1,1
COMMENTS
Row 2 of A249960.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = n^7 + (13/6)*n^6 + (13/3)*n^5 + (65/12)*n^4 + (3/2)*n^3 - (1/12)*n^2 + (2/3)*n.
Conjectures from Colin Barker, Aug 21 2017: (Start)
G.f.: 5*x*(1 + x)*(3 + 74*x + 262*x^2 + 154*x^3 + 11*x^4) / (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>8.
(End)
EXAMPLE
Some solutions for n=5:
..1....5....2....1....3....0....5....2....3....2....3....3....1....3....1....2
..4....1....1....2....4....2....0....3....0....2....0....0....5....0....1....0
..5....5....0....4....0....3....5....0....5....2....5....3....4....1....2....0
..3....5....3....1....4....5....1....1....5....0....4....1....5....3....3....4
..0....3....4....3....5....0....0....2....1....0....0....4....5....3....3....4
..2....5....2....5....0....5....3....0....5....5....2....3....2....3....2....3
..0....5....2....1....2....5....1....4....2....3....5....3....3....0....1....3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 09 2014
STATUS
approved