A146683 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1000-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 27, 543, 1053, 10299, 25793, 392629, 1097335, 60249623, 207343851, 25905457375, 111844208423, 16258459672681, 83988272706599, 16883947506597523

Offset

1,7

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1
.0.0.1.0.0.1.0.0
.1.0.1.0.0.1.0.1
.1.0.0.0.0.0.0.1
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A029510 A029537 A053592 * A146651 A146808 A147232

Adjacent sequences: A146680 A146681 A146682 * A146684 A146685 A146686

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved