A147063 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01010-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 2, 3, 6, 9, 16, 23, 74, 177, 647, 1682, 5837, 15849, 74186, 276554, 1634940, 7124985, 45487535, 222097984, 1721224041, 10469414217, 99805923832

Offset

1,7

Links

Table of n, a(n) for n=1..27.

Example

Maximal 8 X 8 example
.0.0.1.1.1.1.1.0
.0.0.0.1.0.1.0.1
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.1.0.1.0.1.0.0.0
.0.1.1.1.1.1.0.0

Crossrefs

Sequence in context: A051057 A147364 A147227 * A357640 A007865 A052812

Adjacent sequences: A147060 A147061 A147062 * A147064 A147065 A147066

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved