A020999 - OEIS

A020999 as a simple table

n	a(n)
0	1
1	0
2	0
3	1
4	1
5	1
6	1
7	1
8	2
9	2
10	3
11	3
12	5
13	6
14	8
15	10
16	14
17	17
18	24
19	30
20	41
21	53
22	72
23	93
24	126
25	165
26	222
27	293
28	395
29	522
30	704
31	936
32	1259
33	1681
34	2263
35	3027
36	4079
37	5470
38	7371
39	9906
40	13361
41	17980
42	24271
43	32712
44	44182
45	59626
46	80598
47	108879
48	147285
49	199165

[1,0,0,1,1,1,1,1,2,2,3,3,5,6,8,10,14,17,24,30,41, 53,72,93,126,165,222,293,395,522,704,936,1259, 1681,2263,3027,4079,5470,7371,9906,13361,17980, 24271,32712,44182,59626,80598,108879,147285, 199165]