A146823 Number of n X n binary arrays with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.

1, 1, 1, 9, 33, 81, 501, 9765, 253829, 5201161, 149256829, 9047294209, 886839186693, 108530571403501

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.1.1.0.0.1.1.0.0
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
.0.1.0.0.0.1.0.0
.1.0.0.0.0.0.1.0
.1.1.1.1.0.0.1.0
.0.1.0.0.1.1.1.0
.0.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A273316 A101990 A147170 * A147027 A146256 A005920

Adjacent sequences: A146820 A146821 A146822 * A146824 A146825 A146826

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved