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A139018
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Number of n X n symmetric binary matrices containing no more than eight 1s in any 3 X 3 sub-block.
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1
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1, 2, 8, 63, 993, 31272, 1966528, 246968879, 61940593841, 31024191508984, 31032570052707008, 61990776975991833569, 247302484619089362603617, 1970252768237692185884064992, 31347829801520384863039736050304
(list; graph; refs; listen; history; internal format)
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