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A146284
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 111-110-111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 5, 9, 17, 25, 55, 133, 419, 1009, 4455, 14333, 61219, 207501, 982915, 4258653, 26235061, 130258871, 1014665059, 6176852821
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.1.1.1.0.0.0
.1.1.1.0.0.0.1.1.1
.0.1.1.0.0.0.1.1.0
.1.1.1.0.0.0.1.1.1
.0.0.0.1.1.1.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.1.0.1.0.0.0
CROSSREFS
Sequence in context: A351837 A089109 A100449 * A374672 A175543 A200078
KEYWORD
nonn
AUTHOR
STATUS
approved