A146808 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1010-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 27, 613, 1233, 14815, 37647, 702665, 2068725, 127508375, 463231511, 59947853247, 271601475595, 48124416862401, 264540648603861, 70632172948864755

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.0.0.1.0.0.1.0.0
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A053592 A146683 A146651 * A147232 A141417 A264834

Adjacent sequences: A146805 A146806 A146807 * A146809 A146810 A146811

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved