OFFSET
1,1
COMMENTS
Column 3 of A220810
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 12*a(n-1) -26*a(n-2) -72*a(n-3) +180*a(n-4) +152*a(n-5) -438*a(n-6) -146*a(n-7) +526*a(n-8) +46*a(n-9) -244*a(n-10) +24*a(n-11) +64*a(n-12) for n>20
EXAMPLE
Some solutions for n=3
..1..0..0....1..0..1....1..0..1....1..0..0....0..0..0....1..0..1....0..1..1
..0..0..1....0..1..1....1..0..0....0..0..1....0..0..1....1..0..0....0..1..0
..0..0..0....1..1..0....1..1..1....0..1..1....0..0..0....0..1..0....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 22 2012
STATUS
approved