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A145860
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in two by two blocks.
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0
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1, 2, 3, 6, 16, 49, 169, 742, 3848, 23784, 176890, 1574720, 16764539, 214487123, 3284115855, 60203667877, 1323062783686, 34845447884285, 1099257570874298, 41549582286031187, 1881714538522030500, 102107501292816609976
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