Annuity Future Value: Fixed Annuity Future Value Rate

Future Value Factor for a Fixed Annuity with an Annual Interest Rate i (%) and p Payments per Year over n Years
This is the future value factor (compounded) for an annuity where 1 yen is paid annually in p installments (1/p yen every 12/p months) for n years.
(It also calculates the average of the future value rates for a fixed annuity paid annually at the beginning of the period and one paid annually at the end of the period.)