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A056383
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Number of primitive (aperiodic) step shifted (decimated) sequences using a maximum of four different symbols.
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1
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4, 12, 36, 144, 276, 2124, 2796, 17760, 44184, 263004, 419868, 4278000, 5593996, 44748804, 134390724, 539036160, 1073758356, 11453725416, 15271054956, 137575549680, 366528035564, 1759219864020, 3198580043436
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