A251284 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge or main diagonally

9, 71, 822, 18924, 577942, 39473392, 3232216177, 648994836940, 144605658061843, 84335072845188126, 51747558531570898082, 86717653225766506442744, 147921009780997938189659172, 706047665638030677246299851962

Offset

1,1

Comments

Diagonal of A251292

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

Some solutions for n=4
..0..1..0..1..0....0..1..0..1..0....0..1..1..0..0....0..1..1..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..1....0..0..0..0..1
..1..1..0..1..1....0..1..1..0..1....1..0..1..0..0....0..1..1..0..0
..0..0..0..0..0....0..0..0..0..0....1..0..0..0..1....0..0..0..0..1
..1..0..1..1..1....0..1..1..1..0....0..0..1..0..1....1..0..1..0..0

Crossrefs

Sequence in context: A287819 A001706 A368268 * A356239 A324413 A144745

Adjacent sequences: A251281 A251282 A251283 * A251285 A251286 A251287

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved