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A126477
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Number of base 9 n-digit numbers with adjacent digits differing by three or less.
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2
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1, 9, 51, 301, 1787, 10619, 63111, 375091, 2229307, 13249619, 78747531, 468026571, 2781660187, 16532466059, 98258743211, 583989138891, 3470869901227, 20628701920939, 122604233247851, 728683659684651
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text;
internal format)
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