A147499 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0110-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 57, 57, 501, 501, 8327, 8327, 120657, 120657, 1392679, 1392679, 36251459, 36251459, 1768772831, 1768772831

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
.0.1.1.1.0.1.1.1.0
.0.1.1.0.0.0.1.1.0
.1.1.1.0.0.0.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.1.1.1
.0.1.1.0.0.0.1.1.0
.0.1.1.1.0.1.1.1.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A246035 A358128 A147340 * A146591 A146868 A147430

Adjacent sequences: A147496 A147497 A147498 * A147500 A147501 A147502

Keyword

nonn

Author

R. H. Hardin

Status

approved