What are the rules of 0, 1, 4, 15, 64 and 325 What is the rule of 0, 1, 4, 15, 64, 325?

What are the rules of 0, 1, 4, 15, 64 and 325 What is the rule of 0, 1, 4, 15, 64, 325?

(0+1)*1=1
(1+1)*2=4
(4+1)*3=15
(15+1)*4=64
(64+1)*5=325