A260972 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101

48, 133, 372, 1513, 4592, 18706, 45504, 195280, 441072, 2093846, 4057280, 20962048, 38827984, 225849174, 367470344, 2376475916, 3621888816, 26598528246, 37810953848, 300880005340, 400697050360

Offset

1,1

Comments

Diagonal of A260980

Links

Table of n, a(n) for n=1..21.

Example

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

Crossrefs

Cf. A260980

Sequence in context: A295428 A118145 A260833 * A244380 A260493 A003502

Adjacent sequences: A260969 A260970 A260971 * A260973 A260974 A260975

Keyword

nonn

Author

R. H. Hardin, Aug 06 2015

Status

approved