Conditional sequence incrementing

Is it possible to add support (in the form of a handy icon on a sequence) to conditionally increment a sequence when a formula evaluates to true (or something similar)? I need to only increment and assign a sequence when another field is a certain set of values. When not assigning the sequence I need to value to be zero (or whatever I specify for no-increment - current incr value or some default value like zero).

Unfortunately, it’s not. Mockaroo parallelizes data generation onto multiple processors and multiple servers. This means that each row needs to be generated independently of the previous row. Therefore, making calculations based on the value of the previous row is not possible. Nor is it possible to maintain state from one row to another.