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A147470
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.
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0
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1, 1, 1, 3, 5, 9, 19, 55, 245, 1021, 4107, 20679, 138093, 1077295, 9543083, 95957809, 1121795793, 15620825665, 256368054863, 4898555273539, 109719649027999, 2878513446258779, 87946594793312351
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