A146848 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 589, 1209, 14169, 35833, 752335, 2255937, 153849079, 571403355, 75555523219, 350876915239, 81358170973501, 466475370757593, 166717546455270435, 1170203411896641439

Offset

1,7

Links

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

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
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A146707 A146643 A146715 * A146611 A146398 A146406

Adjacent sequences: A146845 A146846 A146847 * A146849 A146850 A146851

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved