A015739 - OEIS

A015739 as a simple table

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	1
7	2
8	1
9	2
10	3
11	3
12	5
13	6
14	7
15	9
16	10
17	12
18	15
19	18
20	22
21	26
22	31
23	36
24	42
25	50
26	58
27	68
28	80
29	92
30	107
31	124
32	142
33	164
34	189
35	216
36	248
37	284
38	323
39	369
40	420
41	476
42	541
43	613
44	693
45	784
46	885
47	997
48	1123
49	1264
50	1419
51	1593
52	1787
53	2000
54	2239
55	2504
56	2795
57	3120
58	3479

[0,0,0,1,1,1,2,1,2,3,3,5,6,7,9,10,12,15,18,22,26, 31,36,42,50,58,68,80,92,107,124,142,164,189,216, 248,284,323,369,420,476,541,613,693,784,885,997, 1123,1264,1419,1593,1787,2000,2239,2504,2795,3120, 3479]