OFFSET
1,1
COMMENTS
Column 2 of A220254
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n)=4*a(n-1)+8*a(n-2)-32*a(n-3)-16*a(n-4)+64*a(n-5)
a(n) = 4^n - 2^(n-2)*(n+1)*(1-(-1)^n). - Vaclav Kotesovec, Jul 06 2013
EXAMPLE
Some solutions for n=3
..0..0....1..1....1..1....1..0....0..1....0..0....0..1....1..0....0..1....0..0
..0..1....0..1....0..0....0..0....1..1....0..0....0..0....0..0....0..1....0..1
..0..0....1..1....0..0....0..1....1..0....1..0....0..0....1..0....0..1....1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 08 2012
STATUS
approved