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A056417
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Number of step cyclic shifted sequences using exactly four different symbols.
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2
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0, 0, 0, 3, 12, 136, 204, 1437, 3520, 20700, 31956, 317513, 390364, 2973536, 8504720, 32471391, 61276740, 622088400, 790198476, 6798297447, 17290258088, 79394956608, 138325216092, 1460955482487
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