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A145940
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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 a 2X2 elbow 1,1 1,2 2,1 in any orientation.
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0
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1, 1, 1, 1, 3, 3, 7, 7, 23, 23, 131, 131, 971, 971, 9431, 9431, 139347, 139347, 2886057, 2886057, 82544813, 82544813, 3341873733, 3341873733, 191910369845, 191910369845, 15522222886741, 15522222886741, 1764362997792863
(list; graph; refs; listen; history; internal format)
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