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A125337
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Number of base 27 circular n-digit numbers with adjacent digits differing by 3 or less.
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0
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1, 27, 177, 915, 5545, 33997, 213621, 1359805, 8748521, 56739057, 370374447, 2430484743, 16019733493, 105982096949, 703383900487, 4681112144755, 31228495404521, 208772665807697, 1398339225679299, 9381662291084581
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