A309879 - OEIS

A309879 as a simple table

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	1
7	2
8	3
9	4
10	5
11	7
12	8
13	11
14	14
15	18
16	22
17	28
18	33
19	40
20	47
21	56
22	65
23	77
24	89
25	104
26	119
27	137
28	155
29	177
30	199
31	225
32	252
33	283
34	315
35	352
36	389
37	432
38	476
39	525
40	576
41	633
42	691
43	756
44	823
45	897
46	973
47	1057
48	1143
49	1237
50	1334
51	1439
52	1547
53	1665
54	1786
55	1917
56	2052

[0,0,0,0,0,1,1,2,3,4,5,7,8,11,14,18,22,28,33,40, 47,56,65,77,89,104,119,137,155,177,199,225,252, 283,315,352,389,432,476,525,576,633,691,756,823, 897,973,1057,1143,1237,1334,1439,1547,1665,1786, 1917,2052]