OFFSET
1,1
COMMENTS
Row 2 of A219714.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/10)*n^5 - (53/24)*n^4 + (117/4)*n^3 - (4099/24)*n^2 + (10233/20)*n - 594 for n>4.
Conjectures from Colin Barker, Jul 27 2018: (Start)
G.f.: x*(10 - 47*x + 117*x^2 - 150*x^3 + 98*x^4 - 27*x^5 + 16*x^6 - 31*x^7 + 30*x^8 - 4*x^9) / (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>10.
(End)
EXAMPLE
Some solutions for n=3:
..2..1..1....0..0..0....2..0..0....2..2..1....2..1..1....2..0..0....2..0..0
..2..1..3....0..0..0....2..0..2....1..1..1....1..0..0....0..0..0....1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 26 2012
STATUS
approved