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A124885
as a simple table
n
a(n)
1
-1
2
-1
3
12
4
22
5
34
6
49
7
68
8
90
9
117
10
147
11
180
12
219
[-1,-1,12,22,34,49,68,90,117,147,180,219]
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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)