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A146606
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 23, 55, 135, 381, 1155, 4259, 15095, 63361, 271287, 1364019, 7046127, 42849769, 267209541, 1961120087, 14636956303, 129172123843, 1159685046407, 12305875469689
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