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A145862
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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in two by two blocks.
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0
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1, 2, 1, 2, 2, 5, 3, 12, 6, 32, 16, 104, 49, 441, 169, 2087, 742, 12047, 3848, 83725, 23784, 695140, 176890, 6907583, 1574720, 82485542, 16764539, 1176502867, 214487123, 20130478473
(list; graph; refs; listen; history; internal format)
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