OFFSET
1,1
COMMENTS
Row 2 of A219627.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/8)*n^4 - (11/12)*n^3 + (63/8)*n^2 - (145/12)*n + 3 for n>3.
Conjectures from Colin Barker, Jul 26 2018: (Start)
G.f.: x*(6 - 19*x + 29*x^2 - 16*x^3 - 7*x^4 + 12*x^5 - x^6 - x^7) / (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>8.
(End)
EXAMPLE
Some solutions for n=3:
..0..0..0....0..0..2....1..1..2....0..0..1....0..0..1....0..0..1....0..0..1
..0..2..2....0..0..2....2..2..2....0..0..1....0..0..0....1..1..1....0..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 24 2012
STATUS
approved