1,2
Diagonal of A218319.
Table of n, a(n) for n=1..8.
Some solutions for n=3:
..0..0..1....1..1..0....0..0..0....1..0..1....1..1..1....1..1..1....1..0..0
..1..1..1....0..1..1....0..1..1....0..1..1....0..0..0....1..0..1....0..1..0
..0..0..1....0..0..0....0..0..1....1..1..0....0..1..1....1..1..1....1..1..0
Sequence in context: A218365 A203326 A092561 * A218280 A218632 A218235
Adjacent sequences: A218309 A218310 A218311 * A218313 A218314 A218315
nonn
R. H. Hardin, Oct 25 2012
approved