SERIESSUM(x,n,m,coefficients)
SERIESSUM function returns the sum of a power series. x is the base of the power series, n is the initial power to raise x, m is the increment to the power for each term in the series, and coefficients are the coefficients by which each successive power of x is multiplied.
Let us assume that the cells A1, A2, ..., A5 contain numbers 1.23, 2.32, 2.98, 3.42, and 4.33. Then
SERIESSUM(3,1,2.23,A1:A5) equals 251416.43018.