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A056338
Number of primitive (aperiodic) reversible string structures with n beads using exactly four different colors.
+0
1
0, 0, 0, 1, 6, 37, 183, 876, 3930, 17179, 73095, 306323, 1267266, 5198374, 21182337, 85910040, 347187210, 1399447578, 5629911015, 22616239535, 90754854843, 363890053582, 1458172596903, 5840531328120, 23385650196084
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Maintained by
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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.
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