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A124948
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Number of base 20 circular n-digit numbers with adjacent digits differing by 2 or less.
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0
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1, 20, 94, 350, 1522, 6670, 29992, 136548, 628362, 2914622, 13606624, 63855108, 300982084, 1423941500, 6758032522, 32161829650, 153427657050, 733475019582, 3513035370640, 16854198764892, 80981882536292, 389635048394172
(list; graph; refs; listen; history; internal format)
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