1,2

Table of n, a(n) for n=1..8.

Some solutions for n=4

..0..0..0..0....0..0..0..0....0..1..1..0....0..0..1..0....0..1..0..1

..1..0..1..0....0..0..0..1....0..0..0..0....1..0..1..1....0..0..0..1

..1..0..0..0....0..0..0..1....0..1..0..0....0..0..0..0....1..0..0..0

..0..0..0..0....0..0..0..0....0..0..1..0....0..0..1..0....0..0..0..0

Sequence in context: A306783 A003024 A224679 * A179473 A248417 A306795

Adjacent sequences: A213596 A213597 A213598 * A213600 A213601 A213602

nonn

R. H. Hardin Jun 14 2012

approved