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A141504
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Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 2 ones in any 2 X 2 subblock.
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1
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1, 2, 1, 11, 7, 195, 85, 8969, 3573, 1232795, 391285, 471487297, 125714303, 516844071813, 113185189874, 1603508113421239, 290842806833709, 14148460147460008963, 2118392163856080466, 354360105981877906958557
(list; graph; refs; listen; history; internal format)
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