A147352 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01010-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 9, 13, 35, 115, 509, 1869, 11373, 63633, 550775, 4084072, 49640647, 508023623, 8372503581

Offset

1,6

Links

Table of n, a(n) for n=1..18.

Example

Maximal 8 X 8 example
.0.1.0.0.1.0.1.0
.1.1.0.1.1.1.1.1
.0.1.1.0.0.1.0.0
.1.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.1
.0.0.1.0.0.1.1.0
.1.1.1.1.1.0.1.1
.0.1.0.1.0.0.1.0

Crossrefs

Sequence in context: A146739 A146723 A146422 * A147391 A241677 A146225

Adjacent sequences: A147349 A147350 A147351 * A147353 A147354 A147355

Keyword

nonn

Author

R. H. Hardin

Status

approved