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A147509
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11110-01111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 15, 23, 53, 159, 467, 1455, 4183, 13257, 47381, 210539, 963601, 4871497, 24721415, 137844971, 829467103, 5811222331
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