A146571 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 33, 697, 1417, 19803, 53699, 1477697, 4737663, 455317519, 1851757293, 336261923485, 1713147308441, 437901036631927, 2765297617197395, 1334447979633012957, 10411206726127074327

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.1.0.0.0.0.0.0.1
.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
.0.0.1.0.0.1.0.0

Crossrefs

Sequence in context: A106527 A223608 A146438 * A235869 A140601 A031206

Adjacent sequences: A146568 A146569 A146570 * A146572 A146573 A146574

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved