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A126372
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Number of base 18 n-digit numbers with adjacent digits differing by one or less.
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4
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1, 18, 52, 152, 446, 1312, 3866, 11406, 33684, 99552, 294410, 871138, 2578808, 7636982, 22624216, 67043480, 198726606, 589195584, 1747255194, 5182477842, 15374283866, 45616475418, 135366696658, 401753608184, 1192506493748
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