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A208468
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Number of 3Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors
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0
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5, 203, 20746, 4132120, 1358524513, 671329819215, 468215145028629, 440379520700561467, 539586833002472556426, 838156377510207185078132, 1614568986664304552415637091, 3787532565162728522045725351515
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