A147461 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 11, 153, 277, 1847, 3941, 42907, 102189, 2677867, 7544909, 418620919, 1424570893, 112979816299, 454603733387, 48372707337627, 228790897270887, 42082899027578731, 234640059600540451

Offset

1,7

Links

Table of n, a(n) for n=1..24.

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
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A019328 A119786 A147429 * A146366 A146603 A159003

Adjacent sequences: A147458 A147459 A147460 * A147462 A147463 A147464

Keyword

nonn

Author

R. H. Hardin

Status

approved