1,1

Diagonal of A231997

R. H. Hardin, Table of n, a(n) for n = 1..19

Some solutions for n=4

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

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

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

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

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

Sequence in context: A136471 A243918 A298896 * A028369 A081790 A053005

Adjacent sequences: A231988 A231989 A231990 * A231992 A231993 A231994

nonn

R. H. Hardin, Nov 16 2013

approved