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A360301
as a simple table
n
a(n)
1
2
2
18
3
84
4
858
5
31122
6
3383898
7
188841114
8
68588585868
9
440400004044
10
7722272777722272
[2,18,84,858,31122,3383898,188841114,68588585868, 440400004044,7722272777722272]