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A245010
as a simple table
n
a(n)
1
2
2
6
3
13
4
57
5
1614
6
3686
7
735417
8
252641277
9
4849631998
10
506364553163
[2,6,13,57,1614,3686,735417,252641277,4849631998, 506364553163]