A260240 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001

48, 213, 1476, 5733, 38280, 416911, 1606456, 7479479, 103497076, 746247122, 2383760912, 25616797423, 351265905756, 1400540744283

Offset

1,1

Comments

Diagonal of A260248

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A260248

Sequence in context: A260098 A260286 A183683 * A260062 A364922 A235759

Adjacent sequences: A260237 A260238 A260239 * A260241 A260242 A260243

Keyword

nonn

Author

R. H. Hardin, Jul 20 2015

Status

approved