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A146004
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2.
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0
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1, 1, 2, 1, 4, 7, 21, 46, 195, 635, 3736, 16722, 140702, 874897, 10218521, 89150959, 1456627028, 17686096248, 403908679949, 6882785245717, 219237062845023, 5210440958351021, 232082441606979544, 7714095184686817142
(list; graph; refs; listen; history; internal format)
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