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A146621
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 5, 13, 33, 131, 465, 2505, 18109, 137539, 1253575, 13645721, 177302103, 2859333451, 55979477433, 1308550606345, 36559028261121, 1227152834528187, 49674730440765147, 2427381380225360097
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