A147103 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

1, 1, 1, 1, 3, 3, 7, 7, 33, 45, 155, 235, 1041, 1865, 10449, 21963, 145411, 358505, 2858721, 8246787, 73843755, 250514431, 2686708159, 10696190873, 134925870103, 635649150983, 9570082275351

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.1.1.1.0.0
.0.0.0.0.0.1.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.1.0.0.0.0.0
.0.0.1.1.1.0.0.0
.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A107222 A050613 A145940 * A003133 A021300 A121527

Adjacent sequences: A147100 A147101 A147102 * A147104 A147105 A147106

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved