OFFSET
1,2
COMMENTS
Column 2 of A214187.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 179*a(n-1) - 6468*a(n-2) + 59396*a(n-3) - 94336*a(n-4).
Conjectures from Colin Barker, Jul 22 2018: (Start)
G.f.: x*(1 - 161*x + 4292*x^2 - 21313*x^3) / ((1 - 2*x)*(1 - 11*x)*(1 - 32*x)*(1 - 134*x)).
a(n) = (2^(n-4)*(67^(n-1)+9) + 11^(n-1) + 3*2^(5*n-7))/3.
(End)
EXAMPLE
Some solutions for n=4:
..0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..1..0..3....1..0..3....3..0..1....1..2..3....1..2..3....1..2..3....1..0..3
..3..4..1....0..3..1....0..1..2....3..0..1....0..1..4....0..1..4....3..4..0
..4..0..2....1..4..0....1..0..3....4..1..5....4..2..0....1..0..5....0..5..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 07 2012
STATUS
approved