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A207209
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Number of 3Xn 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal
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1
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25, 625, 11047, 192640, 3375548, 59151458, 1037800112, 18215805862, 319825973303, 5615850283553, 98614829798053, 1731697303682807, 30409166647098498, 533994742590497215, 9377124049344199017
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