Computes the R1 low-discrepancy quasirandom sequence value for a given index as described by Martin Roberts.
Computes the R2 low-discrepancy quasirandom sequence value for a given index as described by Martin Roberts.
Computes the R3 low-discrepancy quasirandom sequence value for a given index as described by Martin Roberts.
Computes the R4 low-discrepancy quasirandom sequence value for a given index as described by Martin Roberts.