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A220580
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Equals one maps: number of 2Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 2Xn array
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1
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1, 8, 21, 115, 371, 1504, 5240, 19904, 71787, 266591, 973703, 3590009, 13161398, 48409054, 177699822, 653013280, 2398088376, 8809799868, 32356803616, 118855121770, 436550962678, 1603501078153, 5889674104016, 21633105877502
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