In this task you will be given a list of integers. You should only return an integer if the first digit is the same as the last digit in the number. If an integer has a single digit, then it should be returned. If there are no integers that start and end with the same digit then an empty list ("[]") should be returned.
[331, 602, -554, -602, 391, 738, 632, 570, 817, 257, -159, -492, 90, -517, -510]