A147100 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 67, 117, 1095, 2187, 29205, 68767, 1031073, 2764619, 85636311, 266613411, 21897961453, 82048784245, 8655557801397, 38233019016289, 6409762412312631, 33363306208522245, 7840172339778301363

Offset

1,9

Links

Table of n, a(n) for n=1..25.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.0.1.1.1.0.1.1.1.0
.1.1.0.0.0.0.0.1.1
.1.0.0.1.0.1.0.0.1
.1.0.0.1.0.1.0.0.1
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1

Crossrefs

Sequence in context: A229058 A141925 A187990 * A217180 A144094 A044190

Adjacent sequences: A147097 A147098 A147099 * A147101 A147102 A147103

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved