A261257 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101.

36, 52, 288, 1918, 11733, 85506, 1062118, 13599460, 242945986, 5120328922, 155899484972, 5208071829848, 253966207382266, 14042932506665452, 1114055271066551642, 99140006022295429922, 12815515680476819645301

Offset

1,1

Comments

Diagonal of A261265.

Links

R. H. Hardin, Table of n, a(n) for n = 1..22

Example

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

Crossrefs

Cf. A261265.

Sequence in context: A050691 A211720 A261285 * A188243 A335104 A242343

Adjacent sequences: A261254 A261255 A261256 * A261258 A261259 A261260

Keyword

nonn

Author

R. H. Hardin, Aug 13 2015

Status

approved