A146264 Number of n X n binary arrays with all ones connected only in a 110-111-110 pattern in any orientation.

1, 1, 5, 17, 45, 281, 4672, 78267, 1571678, 52679419, 3071977536, 240721783237, 27403978688452, 4744390760050525, 1239071516389632223

Offset

1,3

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.0.1.1.1.0.1.1.1
.0.1.1.1.0.1.1.1
.0.0.1.0.0.0.1.0
.1.1.0.0.0.0.0.0
.1.1.1.0.0.0.1.1
.1.1.0.1.0.1.1.1
.0.0.1.1.1.0.1.1
.0.0.1.1.1.0.0.0

Crossrefs

Sequence in context: A147193 A271302 A147043 * A146216 A046787 A003295

Adjacent sequences: A146261 A146262 A146263 * A146265 A146266 A146267

Keyword

nonn

Author

R. H. Hardin

Status

approved