A146427 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 15, 29, 65, 155, 571, 2003, 10561, 41709, 230027, 1186171, 9353621, 63521901, 612736753, 4999574693, 59290750729, 622330543047

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.0.1.0.0.1.0.0
.1.1.1.1.0.1.1.0
.0.0.0.0.0.1.0.0
.0.0.1.0.0.0.0.0
.0.1.1.0.1.1.1.1
.0.0.1.0.0.1.0.1
.0.1.1.0.0.0.0.0

Crossrefs

Sequence in context: A354161 A211324 A354163 * A202512 A014095 A192356

Adjacent sequences: A146424 A146425 A146426 * A146428 A146429 A146430

Keyword

nonn

Author

R. H. Hardin

Status

approved