OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = n^4 + n^3 + 3*n^2 + 2*n + 2.
Conjectures from Colin Barker, Jan 13 2019: (Start)
G.f.: x*(9 - 3*x + 23*x^2 - 7*x^3 + 2*x^4) / (1 - x)^5.
a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n>5.
(End)
EXAMPLE
Some solutions for n=8:
..0....2....4....3....2....2....5....1....7....2....4....8....4....2....4....7
..2....4....0....6....4....1....0....6....0....8....1....3....2....4....1....6
..8....6....0....8....0....5....0....4....3....0....6....7....7....0....3....2
..5....7....2....4....3....1....4....5....1....1....8....0....4....4....8....7
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 29 2016
STATUS
approved