A091669 - cp's OEIS frontend

A091669 a(n) = (2^(n-1)/n!) * Product_{k=1..n-1} (2^k-1).

n	a(n)
1	1
2	1
3	2
4	7
5	42
6	434
7	7812
8	248031
9	14055090
10	1436430198
11	267176016828
12	91151551074486
13	57425477176926180
14	67196011936600334340
15	146782968474309770332296
16	601204690999713530559792879

[1, 1, 2, 7, 42, 434, 7812, 248031, 14055090, 1436430198, 267176016828, 91151551074486, 57425477176926180, 67196011936600334340, 146782968474309770332296, 601204690999713530559792879]

cp's OEIS Frontend

A091669 a(n) = (2^(n-1)/n!) * Product_{k=1..n-1} (2^k-1).

Table of values

List of values