How do I write these two series in sigma notation

two problems, how do I write them in sigma notation?

1. Write 1 + 4 + 9 + 16 + 25 + 36 in sigma notation.

2. Write -3 + (-2) + (-1) + 0 + 1 in sigma notation.

1. (summation from i = 1 to 6) i^2

2. (summation from i = -3 to 1) i