A147362 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01110-11111 pattern in any orientation.

1, 1, 1, 1, 5, 1, 10, 1, 26, 1, 216, 25, 1652, 141, 19963, 756, 394431, 10461, 8267041, 137862, 246247606, 2668563, 11800979307, 89609916

Offset

1,5

Links

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

Example

Maximal 9 X 9 example
.0.0.0.1.1.1.0.0.0
.0.0.1.1.1.1.1.0.0
.1.0.0.0.0.0.0.0.1
.1.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1.1
.1.0.0.0.0.0.0.0.1
.0.0.1.1.1.1.1.0.0
.0.0.0.1.1.1.0.0.0

Crossrefs

Sequence in context: A105086 A305838 A329373 * A147225 A147061 A147386

Adjacent sequences: A147359 A147360 A147361 * A147363 A147364 A147365

Keyword

nonn

Author

R. H. Hardin

Status

approved