Number of primitive (aperiodic) reversible strings with n beads using a maximum of four different colors.
A056315
Number of primitive (aperiodic) reversible strings with n beads using a maximum of four different colors.
Terms
- a(0) =4a(1) =6a(2) =36a(3) =126a(4) =540a(5) =2034a(6) =8316a(7) =32760a(8) =131544a(9) =524250a(10) =2099196a(11) =8388450a(12) =33562620a(13) =134217594a(14) =536903100a(15) =2147483520a(16) =8590065660a(17) =34359735816a(18) =137439477756a(19) =549755813250
External references
- oeis: A056315