Sequences don't even have to start at 0 or 1, they can start with any number and even be indexed by all integers Z.
Is the first term of a sequence 0 or 1?
Note: Sometimes sequences start with an index of n = 0, so the first term is actually a0. Then the second term would be a1.
Does a sequence start at 0 or 1 calculus?
We need to keep mind, though, that the formula for the general term of a sequence will vary depending on the starting value of n. While we can start a sequence at any value of n we like, n = 0 and n = 1 are the most common starting values. They are the easiest to work with. And they are the two neatest numbers we have.