A146651 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 27, 575, 1125, 11015, 28077, 425211, 1200943, 68898133, 240563637, 37717682283, 167346267341, 25928895855769, 138290723957205, 29142735143015429

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
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
.1.0.1.0.0.1.0.1
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1

Crossrefs

Sequence in context: A029537 A053592 A146683 * A146808 A147232 A141417

Adjacent sequences: A146648 A146649 A146650 * A146652 A146653 A146654

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved