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A126418
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Number of base 31 n-digit numbers with adjacent digits differing by two or less.
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3
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1, 31, 149, 725, 3543, 17361, 85223, 418899, 2061105, 10149405, 50011235, 246566635, 1216199805, 6001382075, 29624479933, 146279954561, 722500541847, 3569422111283, 17638150070523, 87175432519409, 430936179702041
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