Number of primitive (aperiodic) reversible string structures with n beads using exactly four different colors.
A056338
Number of primitive (aperiodic) reversible string structures with n beads using exactly four different colors.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =6a(5) =37a(6) =183a(7) =876a(8) =3930a(9) =17179a(10) =73095a(11) =306323a(12) =1267266a(13) =5198374a(14) =21182337a(15) =85910040a(16) =347187210a(17) =1399447578a(18) =5629911015a(19) =22616239535a(20) =90754854843a(21) =363890053582
External references
- oeis: A056338