A147045 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 45, 45, 273, 273, 2925, 2925, 46625, 46625, 908301, 908301, 25944849, 25944849, 1141847565, 1141847565, 74712257377, 74712257377

Offset

1,9

Links

Table of n, a(n) for n=1..28.

Example

Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.1.1.1.0.1.1.1.0
.1.1.0.0.0.0.0.1.1
.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
.1.1.0.0.0.0.0.1.1
.0.1.1.1.0.1.1.1.0
.0.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A146185 A147399 A147195 * A146065 A146242 A146132

Adjacent sequences: A147042 A147043 A147044 * A147046 A147047 A147048

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved