A147283 Number of n X n binary arrays with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.

1, 1, 1, 9, 41, 209, 1201, 15001, 432817, 13376085, 514375741, 28401013633

Offset

1,4

Links

Table of n, a(n) for n=1..12.

Example

Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.0.1.1.1.0.0.1.0
.0.1.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.1.0.1.0.1.1.0.0
.0.0.1.0.0.1.1.1
.0.0.1.1.1.0.0.1
.0.0.0.0.1.1.0.1

Crossrefs

Sequence in context: A199311 A146239 A083085 * A171422 A129793 A304361

Adjacent sequences: A147280 A147281 A147282 * A147284 A147285 A147286

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved