While writing my paper, I was unaware of the existence of a sequence and I named the sequence (say X). Later I found that the same sequence is already known with some other name (say Y). Currently if my paper is under review, then can I change to Y according to the literature and resend? Or is it okay to continue with the name X I sent?
Note that the novelty of the paper does not completely rely on the sequence used.
Generally speaking the version submitted to a journal or conference is not the version published as it will go through review. However, the nature of the change can affect things. In the worst case, the paper has a predecessor that makes its publication moot, or even invalidates the conclusion. But in the usual case you can make such changes. However, the extent of the changes may make it necessary to have it reviewed again. That is easier for a journal to do than a conference, which has harder deadlines.