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A146717
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 5, 17, 39, 155, 745, 4705, 39573, 369483, 3970963, 54943873, 950039207, 20417177215, 545483266919, 17663079620537, 695250063366563, 33778790635375371
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