A147092 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 59, 101, 919, 1809, 23303, 53143, 671599, 1750531, 39110451, 115146065, 6975569265, 24305619481, 1970620781315, 8024744347051, 1076617600931991, 5122974578707761

Offset

1,9

Links

Table of n, a(n) for n=1..24.

Example

Maximal 9 X 9 example
.1.1.1.1.0.1.1.1.1
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
.0.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.1.1.1.1.0.1.1.1.1

Crossrefs

Sequence in context: A199977 A134573 A106869 * A142298 A231978 A180947

Adjacent sequences: A147089 A147090 A147091 * A147093 A147094 A147095

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved