A147218 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 27, 575, 1091, 10073, 26275, 436817, 1241759, 99221321, 359430255, 57329770665, 261948614931, 43007975306403, 238557155162155, 61726897724737383

Offset

1,7

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A171168 A147202 A146776 * A146856 A217409 A256361

Adjacent sequences: A147215 A147216 A147217 * A147219 A147220 A147221

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved