A147143 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.

1, 1, 1, 1, 3, 5, 7, 11, 39, 91, 199, 489, 1779, 6121, 21635, 87281, 429831

Offset

1,5

Links

Table of n, a(n) for n=1..17.

Example

Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.1.0.1.1.0
.0.0.0.1.1.0.1.1
.0.1.1.0.1.1.0.1
.1.0.1.1.0.1.1.0
.1.1.0.1.1.0.0.0
.0.1.1.0.1.0.0.0
.0.0.1.1.0.0.0.0

Crossrefs

Sequence in context: A230139 A242944 A137355 * A006034 A288716 A083840

Adjacent sequences: A147140 A147141 A147142 * A147144 A147145 A147146

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved