A147448 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 37, 103, 247

Offset

1,10

Links

Table of n, a(n) for n=1..15.

Example

Maximal 10 X 10 example
.0.0.0.0.0.0.0.1.1.0
.0.0.0.0.0.0.1.1.0.1
.0.0.0.0.0.1.1.0.1.1
.0.0.0.0.1.1.0.1.1.0
.0.0.0.1.0.0.1.1.0.0
.0.0.1.1.0.0.1.0.0.0
.0.1.1.0.1.1.0.0.0.0
.1.1.0.1.1.0.0.0.0.0
.1.0.1.1.0.0.0.0.0.0
.0.1.1.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A350676 A186721 A177945 * A146449 A145956 A155225

Adjacent sequences: A147445 A147446 A147447 * A147449 A147450 A147451

Keyword

nonn

Author

R. H. Hardin

Status

approved