A146371 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 13, 25, 41, 95, 287, 1007, 4035, 15127, 64629, 303257, 1705229, 10297463, 68501897, 489679427, 4005352321, 35909136431, 368495419925, 4031093827951, 49953339711585

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.1.0.0.0.0.1.0
.1.1.0.0.1.1.1.1
.0.1.1.0.0.1.0.0
.0.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.0
.0.0.1.0.0.1.1.0
.1.1.1.1.0.0.1.1
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A261599 A144826 A030552 * A146379 A056714 A120074

Adjacent sequences: A146368 A146369 A146370 * A146372 A146373 A146374

Keyword

nonn

Author

R. H. Hardin

Status

approved