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A147226
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11011-01110 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 10, 29, 94, 321, 1262, 7231, 51504, 415403, 3863371, 41121252, 505066528, 7638140887, 140942068334, 3073652987530, 79190388734899, 2405781069528047
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