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A091680 as a simple table

n a(n)
0 290
1 78
2 18
3 6
4 3
5 36
6 21
7 19
8 7
9 8
10 4
11 2
12 1
13 -1
14 -1
15 -1
16 -1
17 -1
18 -1
19 -1
20 -1 

[290,78,18,6,3,36,21,19,7,8,4,2,1,-1,-1,-1,-1,-1,
 -1,-1,-1]

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Last modified September 6 13:38 EDT 2024. Contains 375712 sequences. (Running on oeis4.)