A328611 - OEIS

A328611 as a simple table

n	a(n)
1	0
2	-1
3	1
4	4
5	-1
6	3
7	3
8	6
9	-1
10	4
11	12
12	6
13	8
14	-1
15	7
16	20
17	30
18	10
19	10
20	-1
21	11
22	42
23	60
24	60
25	15
26	12
27	-1
28	18
29	77
30	147
31	140
32	105
33	21
34	14
35	-1
36	29
37	144
38	308
39	392
40	280
41	168
42	28
43	16
44	-1
45	47
46	261
47	648
48	924
49	882
50	504
51	252
52	36
53	18
54	-1
55	76
56	470
57	1305
58	2160
59	2310
60	1764
61	840

[0,-1,1,4,-1,3,3,6,-1,4,12,6,8,-1,7,20,30,10,10, -1,11,42,60,60,15,12,-1,18,77,147,140,105,21,14, -1,29,144,308,392,280,168,28,16,-1,47,261,648,924, 882,504,252,36,18,-1,76,470,1305,2160,2310,1764, 840]