A260601 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101

40, 118, 610, 3388, 26148, 228678, 2707758, 34290074, 611554908, 11693188136, 307867992364, 8702002242846, 342462331784712, 14413275071964342, 841342111382685118, 52702190659812715690

Offset

1,1

Comments

Diagonal of A260609

Links

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

Example

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

Crossrefs

Cf. A260609

Sequence in context: A345970 A235886 A261191 * A234921 A199807 A199810

Adjacent sequences: A260598 A260599 A260600 * A260602 A260603 A260604

Keyword

nonn

Author

R. H. Hardin, Jul 29 2015

Status

approved