A147430 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 89, 89, 469, 469, 5217, 5217, 82459, 82459, 1354121, 1354121, 28702995, 28702995, 915889909, 915889909

Offset

1,9

Links

Table of n, a(n) for n=1..26.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.1.0.1.0.0.0.1.0.1
.1.1.1.1.0.1.1.1.1
.0.1.0.1.0.1.0.1.0
.0.0.0.0.0.0.0.0.0
.0.1.0.1.0.1.0.1.0
.1.1.1.1.0.1.1.1.1
.1.0.1.0.0.0.1.0.1
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A147499 A146591 A146868 * A147462 A146367 A014725

Adjacent sequences: A147427 A147428 A147429 * A147431 A147432 A147433

Keyword

nonn

Author

R. H. Hardin

Status

approved