OFFSET
1,1
COMMENTS
Column 4 of A208050.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 12*a(n-1) - 40*a(n-2) + 68*a(n-3) - 64*a(n-4) for n>5.
Empirical g.f.: x*(5 - 28*x + 60*x^2 - 84*x^3 + 32*x^4) / (1 - 12*x + 40*x^2 - 68*x^3 + 64*x^4). - Colin Barker, Mar 06 2018
EXAMPLE
Some solutions for n=4:
0 1 2 1 0 1 2 0 0 1 0 1 0 1 2 3 0 1 2 3
2 3 0 2 2 0 1 2 2 3 2 3 2 3 0 1 2 3 0 1
1 2 1 3 1 3 0 1 0 1 0 1 0 1 3 0 1 2 3 2
3 0 2 0 2 1 2 3 2 3 2 0 2 0 2 1 3 1 0 1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2012
STATUS
approved