A194924 - cp's OEIS frontend

A194924 The number of set partitions of {1,2,...,n} into exactly two subsets A,B such that the greatest common divisor of |A| and |B| = 1.

n	a(n)
2	1
3	3
4	4
5	15
6	6
7	63
8	64
9	171
10	130
11	1023
12	804
13	4095
14	2380
15	7920
16	16384
17	65535
18	40410
19	262143
20	246640
21	582771
22	695860
23	4194303
24	2884776
25	13455325
26	11576916
27	44739243
28	65924824
29	268435455
30	176422980
31	1073741823
32	1073741824
33	2669774811
34	3128164186
35	11421338075

[1, 3, 4, 15, 6, 63, 64, 171, 130, 1023, 804, 4095, 2380, 7920, 16384, 65535, 40410, 262143, 246640, 582771, 695860, 4194303, 2884776, 13455325, 11576916, 44739243, 65924824, 268435455, 176422980, 1073741823, 1073741824, 2669774811, 3128164186, 11421338075]

cp's OEIS Frontend

A194924 The number of set partitions of {1,2,...,n} into exactly two subsets A,B such that the greatest common divisor of |A| and |B| = 1.

Table of values

List of values