A147506 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11110-01111 pattern in any orientation.

1, 1, 1, 1, 3, 5, 13, 17, 45, 89, 2453, 5391, 90561, 234023, 4542721, 13430469, 852217819, 3057070197, 235450310313, 994613290405, 113069663601167, 560671202395083, 138912840204968035

Offset

1,5

Links

Table of n, a(n) for n=1..23.

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
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A307512 A080076 A128339 * A360801 A282960 A275969

Adjacent sequences: A147503 A147504 A147505 * A147507 A147508 A147509

Keyword

nonn

Author

R. H. Hardin

Status

approved