Explanation

The sequence is formed by adding consecutive terms that are three times larger than the previous gap.

2 + 2 = 4 (gap of 2)

4 + 6 = 10 (gap of 6, which is 3 times 2)

10 + 18 = 28 (gap of 18, which is 3 times 6)

28 + 54 = 82 (gap of 54, which is 3 times 18)