A147055 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 55, 157, 613, 2645, 10617, 38367, 155201, 818161, 5194409, 36087637, 257389985

Offset

1,8

Links

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

Example

Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.1.1.0.1.0.0
.0.1.0.1.0.0.1.1
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.1.1.0.0.1.0.1.0
.0.0.1.0.1.1.0.0
.0.0.1.1.1.0.0.0

Crossrefs

Sequence in context: A058331 A328950 A049749 * A146638 A147135 A146843

Adjacent sequences: A147052 A147053 A147054 * A147056 A147057 A147058

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved