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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.
0
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved