A175780 - OEIS

A175780 as a simple table

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	2
7	4
8	6
9	9
10	13
11	18
12	24
13	31
14	39
15	48
16	58
17	70
18	83
19	98
20	114
21	132
22	152
23	174
24	198
25	224
26	252
27	282
28	314
29	349
30	386
31	426
32	468
33	513
34	561
35	612
36	666
37	723
38	783
39	846
40	912
41	982
42	1055
43	1132
44	1212
45	1296
46	1384
47	1476
48	1572
49	1672
50	1776

[0,0,0,0,0,1,2,4,6,9,13,18,24,31,39,48,58,70,83, 98,114,132,152,174,198,224,252,282,314,349,386, 426,468,513,561,612,666,723,783,846,912,982,1055, 1132,1212,1296,1384,1476,1572,1672,1776]