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A239099 as a simple table

n a(n)
0 1
1 1
2 21
3 671
4 180323
5 20898423
6 7426362705
7 1874409465055

[1,1,21,671,180323,20898423,7426362705,
 1874409465055]

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Last modified January 19 03:54 EST 2020. Contains 331031 sequences. (Running on oeis4.)