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A146999
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 2, 3, 5, 7, 13, 19, 53, 121, 389, 940, 3064, 7695, 29728, 97515, 493327, 1920641, 10778992, 46183271, 290012194, 1476840183, 11445253811
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