A147377 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 11, 15, 241, 427, 4185, 8653, 87751, 203323, 3730869, 9866343, 357089469, 1093277721, 68995024703, 247016437881, 25144161711781, 105091314370945

Offset

1,9

Links

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

Example

Maximal 9 X 9 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
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.0.0.1.0.0.0.1.0.0
.0.1.1.0.0.0.1.1.0
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1

Crossrefs

Sequence in context: A267123 A115779 A147339 * A147333 A097156 A138791

Adjacent sequences: A147374 A147375 A147376 * A147378 A147379 A147380

Keyword

nonn

Author

R. H. Hardin

Status

approved