A147017 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 15, 21, 45, 77, 277, 567, 2577, 6557, 31507, 89591, 535509, 1822317, 13376361, 54721945, 461666973, 2203494951, 22033823051

Offset

1,8

Links

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

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: A261274 A014493 A147025 * A171570 A350987 A076825

Adjacent sequences: A147014 A147015 A147016 * A147018 A147019 A147020

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved