A147048 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 5, 5, 13, 13, 29, 29, 101, 101, 469, 469, 2569, 2569, 14457, 14457, 96029, 96029, 884501, 884501, 9747473

Offset

1,9

Links

Table of n, a(n) for n=1..29.

Example

Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1
.0.1.0.0.0.0.0.1.0
.0.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.0.1.0
.1.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A335357 A325679 A147198 * A110192 A014414 A087745

Adjacent sequences: A147045 A147046 A147047 * A147049 A147050 A147051

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved