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A145955
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
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0
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1, 1, 1, 3, 9, 23, 125, 821, 6239, 71403, 1048093, 19913069, 517074745, 17642361171, 795865550951, 47901047706833, 3815017258032049, 403246928224172293, 56605968541991726917, 10536114891916229568297, 2602764408693859006627701
(list; graph; refs; listen; history; internal format)
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