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A140964
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Number of n X n symmetric binary matrices with each 1 adjacent to an odd number of other 1's.
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1
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1, 1, 3, 10, 47, 331, 3767, 62520, 1518009, 55743394, 3088601538, 255245736384, 31478354074963, 5821763616950936, 1613533542340366588, 669043996295174916639, 415143729274794925159205
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