A146366 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 11, 177, 319, 3003, 6719, 139575, 376577, 21426367, 72064749, 6669830837, 27576142719, 4258398011821, 21562611148069, 6466129232821053, 40212251188406927, 23038062541403770861, 176166950254157836203

Offset

1,7

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A119786 A147429 A147461 * A146603 A159003 A352004

Adjacent sequences: A146363 A146364 A146365 * A146367 A146368 A146369

Keyword

nonn

Author

R. H. Hardin

Status

approved