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A146459
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 9, 19, 53, 91, 437, 1171, 6755, 23673, 190687, 829933, 7917835, 43969469, 541189453, 3877768971, 62027074701, 569529515425
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