A147027 Number of n X n binary arrays with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.

1, 1, 1, 9, 33, 81, 593, 11281, 273235, 6759617, 249956567, 17607387437, 1915544919591, 282005360821455

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.1.1.1.1.0.0.1.1
.0.1.0.0.1.1.1.0
.0.1.0.0.0.0.1.0
.0.0.1.0.0.1.0.0
.0.0.1.0.1.1.0.0
.1.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A101990 A147170 A146823 * A146256 A005920 A020324

Adjacent sequences: A147024 A147025 A147026 * A147028 A147029 A147030

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved