A018122 - OEIS

A018122 as a simple table

n	a(n)
0	1
1	2
2	2
3	2
4	3
5	3
6	4
7	5
8	6
9	8
10	9
11	12
12	14
13	18
14	22
15	27
16	34
17	42
18	53
19	66
20	81
21	101
22	126
23	157
24	196
25	243
26	303
27	378
28	470
29	586
30	729
31	909
32	1132
33	1410
34	1756
35	2187
36	2725
37	3394
38	4228
39	5267
40	6561
41	8174
42	10182
43	12684
44	15801
45	19683

[1,2,2,2,3,3,4,5,6,8,9,12,14,18,22,27,34,42,53,66, 81,101,126,157,196,243,303,378,470,586,729,909, 1132,1410,1756,2187,2725,3394,4228,5267,6561,8174, 10182,12684,15801,19683]