OFFSET
1,1
COMMENTS
Column 3 of A267232.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 9*a(n-1) - 29*a(n-2) + 39*a(n-3) - 18*a(n-4) for n > 5.
Conjectures from Colin Barker, Feb 05 2018: (Start)
G.f.: 2*x*(2 - 10*x + 13*x^2 - x^3 - 3*x^4) / ((1 - x)*(1 - 2*x)*(1 - 3*x)^2).
a(n) = (-9 - 9*2^n + 11*3^(1+n) + 2*3^n*n) / 18 for n>1.
(End)
EXAMPLE
Some solutions for n=6:
2 0 1 2 3 2 1 2 3 0 3 1 1 3 2 3
3 1 3 0 0 1 2 3 1 1 2 0 0 3 0 2
2 0 1 2 3 3 3 0 3 0 1 2 3 0 2 3
0 3 3 3 1 2 0 2 1 1 3 1 0 2 3 0
3 3 2 3 1 2 1 3 2 2 2 0 1 1 1 1
0 2 0 0 0 0 2 1 2 3 0 3 3 0 1 2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2016
STATUS
approved