A000931 - OEIS

A000931 as a simple table

n	a(n)
0	1
1	0
2	0
3	1
4	0
5	1
6	1
7	1
8	2
9	2
10	3
11	4
12	5
13	7
14	9
15	12
16	16
17	21
18	28
19	37
20	49
21	65
22	86
23	114
24	151
25	200
26	265
27	351
28	465
29	616
30	816
31	1081
32	1432
33	1897
34	2513
35	3329
36	4410
37	5842
38	7739
39	10252
40	13581
41	17991
42	23833
43	31572
44	41824
45	55405
46	73396
47	97229
48	128801
49	170625

[1,0,0,1,0,1,1,1,2,2,3,4,5,7,9,12,16,21,28,37,49, 65,86,114,151,200,265,351,465,616,816,1081,1432, 1897,2513,3329,4410,5842,7739,10252,13581,17991, 23833,31572,41824,55405,73396,97229,128801,170625]