A005329 - cp's OEIS frontend

A005329 a(n) = Product_{i=1..n} (2^i - 1). Also called 2-factorial numbers.

n	a(n)
0	1
1	1
2	3
3	21
4	315
5	9765
6	615195
7	78129765
8	19923090075
9	10180699028325
10	10414855105976475
11	21319208401933844325
12	87302158405919092510875
13	715091979502883286756577125
14	11715351900195736886933003038875
15	383876935713713710574133710574817125

[1, 1, 3, 21, 315, 9765, 615195, 78129765, 19923090075, 10180699028325, 10414855105976475, 21319208401933844325, 87302158405919092510875, 715091979502883286756577125, 11715351900195736886933003038875, 383876935713713710574133710574817125]

cp's OEIS Frontend

A005329 a(n) = Product_{i=1..n} (2^i - 1). Also called 2-factorial numbers.

Table of values

List of values