OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-2) + 16*a(n-4) - 16*a(n-6) for n>8.
Empirical g.f.: 8*x*(135188 + 1986*x - 134215*x^2 - 952*x^3 - 2162396*x^4 - 31210*x^5 + 2148463*x^6 + 18176*x^7) / ((1 - x)*(1 + x)*(1 - 2*x)*(1 + 2*x)*(1 + 4*x^2)). - Colin Barker, Dec 15 2018
EXAMPLE
Some solutions for n=1.
..0..0..1..2..0..2..1....0..0..1..2..1..2..2....0..0..2..1..2..1..0
..1..0..2..1..1..1..0....2..0..1..1..0..2..2....0..0..2..0..2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2015
STATUS
approved