1,1

Column 5 of A221072

Table of n, a(n) for n=1..7.

Some solutions for n=3

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

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

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

Sequence in context: A087887 A288486 A223291 * A272125 A166756 A268623

Adjacent sequences: A221066 A221067 A221068 * A221070 A221071 A221072

nonn

R. H. Hardin Dec 31 2012

approved