A146674 Number of n X n binary arrays with all ones connected only in a 1100-0111-1100 pattern in any orientation.

1, 1, 1, 9, 25, 93, 633, 8913, 136370, 2447483, 66801664, 2869431585, 170625522480, 13470400903777

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.1.1.0.0.0.1.0.1
.0.1.1.1.0.1.1.1
.1.1.0.0.0.0.1.0
.0.0.0.0.0.0.1.0
.0.0.0.0.0.0.0.0
.1.1.0.0.1.1.0.0
.0.1.1.1.0.1.1.1
.1.1.0.0.1.1.0.0

Crossrefs

Sequence in context: A147332 A147460 A147475 * A083672 A193644 A083100

Adjacent sequences: A146671 A146672 A146673 * A146675 A146676 A146677

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved