A015740 - OEIS

A015740 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	1
7	1
8	2
9	2
10	2
11	3
12	4
13	4
14	6
15	8
16	9
17	11
18	14
19	16
20	19
21	23
22	27
23	32
24	38
25	45
26	53
27	62
28	72
29	84
30	97
31	112
32	130
33	150
34	172
35	199
36	228
37	260
38	298
39	340
40	386
41	440
42	500
43	566
44	642
45	727
46	820
47	926
48	1044
49	1174
50	1321
51	1484
52	1664
53	1866
54	2090

[0,0,0,0,1,1,1,2,2,2,3,4,4,6,8,9,11,14,16,19,23, 27,32,38,45,53,62,72,84,97,112,130,150,172,199, 228,260,298,340,386,440,500,566,642,727,820,926, 1044,1174,1321,1484,1664,1866,2090]