A147020 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 01000-11111-01000 pattern in any orientation.

1, 1, 1, 1, 3, 1, 15, 9, 133, 33, 3625, 1063, 187163, 37071, 15421524, 1848587, 2304715815, 239808955, 763574051396, 59268926793, 494418074953389, 27771432799839

Offset

1,5

Links

Table of n, a(n) for n=1..22.

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
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A318392 A329059 A147453 * A134685 A130757 A181996

Adjacent sequences: A147017 A147018 A147019 * A147021 A147022 A147023

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved