A146184 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 87, 301, 1337, 5927, 24359, 118543, 715115, 5164241, 42357883, 353625469, 3347092839, 36905312969, 482588953149, 7069762004523, 114903134718451

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.1.1.1.0.0.0
.0.1.0.1.1.0.0.0
.0.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.0
.0.0.0.1.1.0.1.0
.0.0.0.1.1.1.0.0
.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A146401 A146465 A147119 * A155274 A058058 A348308

Adjacent sequences: A146181 A146182 A146183 * A146185 A146186 A146187

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved