A146463 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 361, 361, 6061, 6061, 172273, 172273, 5274005, 5274005, 274545571, 274545571, 26127520797, 26127520797

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.0.0.0.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A146833 A146700 A146708 * A146841 A147180 A146644

Adjacent sequences: A146460 A146461 A146462 * A146464 A146465 A146466

Keyword

nonn

Author

R. H. Hardin

Status

approved