A022872 - OEIS

A022872 as a simple table

n	a(n)
1	2
2	2
3	1
4	2
5	3
6	2
7	3
8	4
9	4
10	6
11	7
12	9
13	11
14	14
15	19
16	23
17	31
18	40
19	51
20	66
21	86
22	113
23	146
24	191
25	250
26	326
27	427
28	556
29	727
30	952
31	1244
32	1627
33	2129
34	2784
35	3643
36	4765
37	6234
38	8157
39	10673
40	13963
41	18271
42	23908
43	31281
44	40929
45	53555
46	70075
47	91690
48	119977
49	156987

[2,2,1,2,3,2,3,4,4,6,7,9,11,14,19,23,31,40,51,66, 86,113,146,191,250,326,427,556,727,952,1244,1627, 2129,2784,3643,4765,6234,8157,10673,13963,18271, 23908,31281,40929,53555,70075,91690,119977,156987]