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A198006 as a simple table

n a(n)
1 1
2 4
3 33
4 328
5 7415
6 275014
7 18684018
8 2307507868
9 504270356235

[1,4,33,328,7415,275014,18684018,2307507868,
 504270356235]

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Last modified February 1 20:55 EST 2023. Contains 359996 sequences. (Running on oeis4.)