A146997 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 6, 1, 15, 1, 79, 13, 545, 41, 5277, 308, 66438, 2695, 1162610, 29727, 27605281, 454197, 898228670, 10169685, 40179297824, 297550563

Offset

1,7

Links

Table of n, a(n) for n=1..26.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.1.1.1.1.0.0
.1.0.0.0.1.0.0.0.1
.1.0.0.0.1.0.0.0.1
.1.1.1.0.0.0.1.1.1
.1.0.0.0.1.0.0.0.1
.1.0.0.0.1.0.0.0.1
.0.0.1.1.1.1.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A176121 A062190 A080211 * A147483 A050309 A103217

Adjacent sequences: A146994 A146995 A146996 * A146998 A146999 A147000

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved