A147005 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-11111-00100 pattern in any orientation.

1, 1, 1, 1, 3, 1, 5, 1, 8, 1, 60, 7, 328, 21, 2111, 77, 21687, 479, 274683, 3600, 4419391

Offset

1,5

Links

Table of n, a(n) for n=1..21.

Example

Maximal 9 X 9 example
.0.0.0.0.1.0.0.0.0
.0.0.1.1.1.1.1.0.0
.0.1.0.0.1.0.0.1.0
.0.1.0.0.0.0.0.1.0
.1.1.1.0.0.0.1.1.1
.0.1.0.0.0.0.0.1.0
.0.1.0.0.1.0.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A339236 A029669 A050329 * A254577 A051707 A302787

Adjacent sequences: A147002 A147003 A147004 * A147006 A147007 A147008

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved