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A061915 as a simple table

n a(n)
0 0
1 2
2 2
3 6
4 4
5 -1
6 6
7 686
8 8
9 666
10 2
11 22
12 444
13 2002
14 686
15 -1
16 464
17 646
18 666
19 646
20 2
21 6006
22 22
23 828
24 888
25 -1
26 2002
27 8886888
28 868
29 464
30 6
31 868
32 4224
33 66
34 646
35 -1
36 828
37 222
38 646
39 6006
40 4
41 22222
42 6006
43 68886
44 44
45 -1
46 828
47 282
48 4224
49 686
50 -1
51 42024
52 4004
53 424
54 8886888
55 -1
56 8008
57 68286
58 464
59 68086
60 6

[0,2,2,6,4,-1,6,686,8,666,2,22,444,2002,686,-1,
 464,646,666,646,2,6006,22,828,888,-1,2002,8886888,
 868,464,6,868,4224,66,646,-1,828,222,646,6006,4,
 22222,6006,68886,44,-1,828,282,4224,686,-1,42024,
 4004,424,8886888,-1,8008,68286,464,68086,6]

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Last modified July 2 16:14 EDT 2020. Contains 335404 sequences. (Running on oeis4.)