OFFSET
1,1
COMMENTS
Column 2 of A206472.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 11*a(n-1) - 176*a(n-3) + 256*a(n-4).
Empirical g.f.: x*(121 + 80*x - 4496*x^2 + 6912*x^3) / ((1 - 4*x)*(1 + 4*x)*(1 - 11*x + 16*x^2)). - Colin Barker, Jun 16 2018
EXAMPLE
Some solutions for n=4:
2 2 1 2 1 0 2 2 1 0 0 0 0 0 1 0 0 0 2 0 1
0 0 0 0 0 0 0 0 0 1 2 0 1 0 1 0 1 2 2 0 1
0 0 2 1 1 0 2 1 1 0 0 0 2 0 2 0 0 0 1 0 1
2 0 1 0 0 0 0 0 0 1 1 2 0 0 1 2 1 2 0 0 1
0 0 2 0 0 2 1 1 0 0 0 0 1 0 0 0 0 0 2 0 1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 08 2012
STATUS
approved