A006141 - OEIS

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A006141 as a simple table

n	a(n)
1	1
2	0
3	0
4	1
5	1
6	1
7	1
8	1
9	2
10	2
11	3
12	3
13	4
14	4
15	5
16	6
17	7
18	8
19	10
20	11
21	13
22	15
23	17
24	19
25	23
26	25
27	29
28	33
29	38
30	42
31	49
32	54
33	62
34	69
35	78
36	87
37	99
38	109
39	123
40	137
41	154
42	170
43	191
44	211
45	236
46	261
47	290
48	320
49	357
50	392
51	435
52	479
53	530
54	582
55	644
56	706
57	779
58	854
59	940
60	1029
61	1133
62	1237
63	1358
64	1485

[1,0,0,1,1,1,1,1,2,2,3,3,4,4,5,6,7,8,10,11,13,15, 17,19,23,25,29,33,38,42,49,54,62,69,78,87,99,109, 123,137,154,170,191,211,236,261,290,320,357,392, 435,479,530,582,644,706,779,854,940,1029,1133, 1237,1358,1485]