A146438 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 33, 673, 1349, 16579, 42631, 824515, 2487353, 285732571, 1128078211, 244308162719, 1217583661167, 271820883924773, 1679182849432793, 641385613295979887, 4838837888901051803

Offset

1,7

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A362410 A106527 A223608 * A146571 A235869 A140601

Adjacent sequences: A146435 A146436 A146437 * A146439 A146440 A146441

Keyword

nonn

Author

R. H. Hardin

Status

approved