A146814 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1010-1111 pattern in any orientation.

1, 1, 1, 1, 5, 17, 51, 255, 1303, 6487, 45597, 373491, 4375333, 54687233, 1001558187, 19226580191

Offset

1,5

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example:
.1.1.1.1.0.0.0.1
.1.0.1.0.0.0.1.1
.1.0.0.0.0.0.0.1
.0.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.0
.1.0.0.0.0.0.0.1
.1.1.0.0.0.1.0.1
.1.0.0.0.1.1.1.1

Crossrefs

Sequence in context: A116521 A290900 A137500 * A034335 A337033 A190173

Adjacent sequences: A146811 A146812 A146813 * A146815 A146816 A146817

Keyword

nonn,more

Author

R. H. Hardin, Nov 04 2008

Status

approved