A260919 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101

36, 68, 401, 2208, 11608, 81848, 971381, 10662976, 181422568, 3460352248, 98952552192, 2935432680396, 136085020244379, 6702623882827610, 502445435345158337, 39885899773762437744, 4881874517425716225227

Offset

1,1

Comments

Diagonal of A260927

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

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

Crossrefs

Cf. A260927

Sequence in context: A068144 A182428 A208128 * A247381 A249726 A335463

Adjacent sequences: A260916 A260917 A260918 * A260920 A260921 A260922

Keyword

nonn

Author

R. H. Hardin, Aug 04 2015

Status

approved