A146798 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 9, 49, 253, 1201, 4573, 30217, 286533, 2941009, 37746461, 678979449, 14880214645, 369497873441

Offset

1,6

Links

Table of n, a(n) for n=1..17.

Example

Maximal 8 X 8 example
.1.1.1.1.0.0.0.0
.0.1.0.0.0.0.0.1
.0.1.1.0.0.1.0.1
.1.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.1
.1.0.1.0.0.1.1.0
.1.0.0.0.0.0.1.0
.0.0.0.0.1.1.1.1

Crossrefs

Sequence in context: A081655 A181539 A224473 * A055428 A359186 A012231

Adjacent sequences: A146795 A146796 A146797 * A146799 A146800 A146801

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved