Sigma or Summation function in Excel

Question

Given a value (in a cell), calculate a formula like this:

Ʃ(3i+1) for i from 0 to the value specified in the cell.

SUM(), SERIESSUM() are not suitable in thi

Answer 1

What about

=(3/2*n+1)*(n+1)

for 0 as lower bound and n is your upper bound