A147428 Number of n X n binary arrays with all ones connected only in a 1010-1111-0101 pattern in any orientation.

1, 1, 1, 9, 25, 89, 469, 5217, 82459, 1354121, 28702995, 915889909, 44493843165, 2922255231469

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.0.1.0.1.0.0.1.1
.1.1.1.1.0.1.1.0
.1.0.1.0.0.0.1.1
.0.0.0.0.0.1.1.0
.1.1.0.0.0.0.0.0
.0.1.1.0.0.1.0.1
.1.1.0.0.1.1.1.1
.0.1.1.0.1.0.1.0

Crossrefs

Sequence in context: A147413 A066137 A269662 * A147436 A189118 A075067

Adjacent sequences: A147425 A147426 A147427 * A147429 A147430 A147431

Keyword

nonn

Author

R. H. Hardin

Status

approved