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A030019 as a simple table

n a(n)
0 1
1 1
2 1
3 4
4 29
5 311
6 4447
7 79745
8 1722681
9 43578820
10 1264185051
11 41381702275
12 1509114454597
13 60681141052273
14 2667370764248023
15 127258109992533616
16 6549338612837162225
17 361680134713529977507
18 21333858798449021030515
19 1338681172839439064846881

[1,1,1,4,29,311,4447,79745,1722681,43578820,
 1264185051,41381702275,1509114454597,
 60681141052273,2667370764248023,
 127258109992533616,6549338612837162225,
 361680134713529977507,21333858798449021030515,
 1338681172839439064846881]

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Last modified January 21 05:39 EST 2020. Contains 331104 sequences. (Running on oeis4.)