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A198004 as a simple table

n a(n)
1 1
2 4
3 21
4 265
5 5408
6 284316
7 27312550
8 4644354501
9 1817882439930

[1,4,21,265,5408,284316,27312550,4644354501,
 1817882439930]

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)