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Search: id:A141508
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| A141508 |
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Number of n X n binary matrices, symmetric under 180 degree rotation, with no more than 2 ones in any 2 X 2 subblock. |
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| 1, 2, 3, 19, 93, 1575, 21225, 1007325, 39296735, 5294789855, 584025270873, 223173910768577, 70041418150889563, 76024730608891641301, 67725956302664583147084, 208747768532396398250753135, 528233319697505378983008951127
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