A147182 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 45, 119, 351, 1205, 4331, 19073, 79485, 399897, 2087281, 12888453, 83190775

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.0.0.0.1.0.1.0.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.0.1.1
.0.1.1.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.1.1.0
.1.1.0.0.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.0.1.0.1.0.0.0.0

Crossrefs

Sequence in context: A147220 A269713 A196069 * A146175 A146851 A146260

Adjacent sequences: A147179 A147180 A147181 * A147183 A147184 A147185

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved