A144389 - OEIS

A144389 as a simple table

n	a(n)
0	-1
1	2
2	-1
3	1
4	4
5	-1
6	4
7	3
8	6
9	-1
10	3
11	16
12	6
13	8
14	-1
15	6
16	15
17	40
18	10
19	10
20	-1
21	5
22	36
23	45
24	80
25	15
26	12
27	-1
28	8
29	35
30	126
31	105
32	140
33	21
34	14
35	-1
36	7
37	64
38	140
39	336
40	210
41	224
42	28
43	16
44	-1
45	10
46	63
47	288
48	420
49	756
50	378
51	336
52	36
53	18
54	-1
55	9
56	100
57	315
58	960
59	1050
60	1512
61	630
62	480
63	45
64	20
65	-1

[-1,2,-1,1,4,-1,4,3,6,-1,3,16,6,8,-1,6,15,40,10, 10,-1,5,36,45,80,15,12,-1,8,35,126,105,140,21,14, -1,7,64,140,336,210,224,28,16,-1,10,63,288,420, 756,378,336,36,18,-1,9,100,315,960,1050,1512,630, 480,45,20,-1]

[-1,2,-1,1,4,-1,4,3,6,-1,3,16,6,8,-1,6,15,40,10,
 10,-1,5,36,45,80,15,12,-1,8,35,126,105,140,21,14,
 -1,7,64,140,336,210,224,28,16,-1,10,63,288,420,
 756,378,336,36,18,-1,9,100,315,960,1050,1512,630,
 480,45,20,-1]