A147483 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11011-01110-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 6, 1, 15, 1, 83, 13, 668, 49, 6957, 332, 94212, 3073, 1778981, 36531, 47461296, 597879, 1754228305, 14127501, 89063295956, 454449581

Offset

1,7

Links

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

Example

Maximal 9 X 9 example
.0.0.1.1.0.1.1.0.0
.0.0.0.1.1.1.0.0.0
.1.0.0.0.1.0.0.0.1
.1.1.0.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.0.1.1
.1.0.0.0.1.0.0.0.1
.0.0.0.1.1.1.0.0.0
.0.0.1.1.0.1.1.0.0

Crossrefs

Sequence in context: A062190 A080211 A146997 * A050309 A103217 A136273

Adjacent sequences: A147480 A147481 A147482 * A147484 A147485 A147486

Keyword

nonn

Author

R. H. Hardin

Status

approved