1,2

Diagonal of A213418

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

Some solutions for n=4

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

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

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

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

Sequence in context: A301401 A162132 A297051 * A226428 A277421 A171612

Adjacent sequences: A213409 A213410 A213411 * A213413 A213414 A213415

nonn

R. H. Hardin and N. J. A. Sloane Jun 10 2012

approved