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A056315
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Number of primitive (aperiodic) reversible strings with n beads using a maximum of four different colors.
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2
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4, 6, 36, 126, 540, 2034, 8316, 32760, 131544, 524250, 2099196, 8388450, 33562620, 134217594, 536903100, 2147483520, 8590065660, 34359735816, 137439477756, 549755813250, 2199025344348, 8796093020154
(list; graph; refs; listen; history; internal format)
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