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A147137
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1001-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 13, 33, 61, 123, 351, 1083, 3363, 12745, 54981, 257267, 1349181, 7264663, 42437683, 269731743
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