A147015 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11111-00010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 11, 17, 29, 49, 193, 509, 1945, 5173, 19089, 57135, 304805, 1236463, 7710953, 34938029, 239632727, 1249524805, 10579289505, 68493745825

Offset

1,9

Links

Table of n, a(n) for n=1..28.

Example

Maximal 9 X 9 example
.0.0.0.0.0.1.0.0.0
.0.0.1.1.1.1.1.0.0
.0.1.0.1.0.0.0.1.0
.0.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.1.1.0
.0.1.0.0.0.1.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.1.0.0.0.0.0

Crossrefs

Sequence in context: A023218 A073022 A129694 * A147023 A108402 A090795

Adjacent sequences: A147012 A147013 A147014 * A147016 A147017 A147018

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved