A147052 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 509, 957, 9009, 23635, 500815, 1453635, 110991021, 410901579, 51936051799, 236370303513, 42297696189623, 235560923543349, 80009496099425831, 544930757644765859

Offset

1,7

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 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
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A050845 A219396 A125613 * A147132 A146840 A146587

Adjacent sequences: A147049 A147050 A147051 * A147053 A147054 A147055

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved