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A056289
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Number of primitive (period n) n-bead necklaces with exactly four different colored beads.
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3
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0, 0, 0, 6, 48, 260, 1200, 5100, 20720, 81828, 318000, 1222870, 4675440, 17813820, 67769504, 257695800, 980240880, 3731732200, 14222737200, 54278498154, 207438936800, 793940157900, 3043140078000, 11681056021300
(list; graph; refs; listen; history; internal format)
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