A147018 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.

1, 1, 1, 1, 5, 9, 21, 35, 177, 589, 4235, 15969, 164553, 879607, 12456629, 97189937, 1947709409, 20669429409

Offset

1,5

Links

Table of n, a(n) for n=1..18.

Example

Maximal 8 X 8 example
.0.1.0.0.0.0.1.0
.1.1.0.1.1.1.1.1
.0.1.0.0.1.0.0.0
.0.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.0
.0.0.0.1.0.0.1.0
.1.1.1.1.1.0.1.1
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A146827 A297360 A216414 * A081883 A049744 A000323

Adjacent sequences: A147015 A147016 A147017 * A147019 A147020 A147021

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved