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A146036
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 11, 17, 43, 77, 281, 645, 3017, 9213, 61533, 218977, 1561879, 6900617, 60762405, 333893691, 3718652761, 25349082469, 352708796463, 2947039725027
(list; graph; refs; listen; history; internal format)
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