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A020025 as a simple table

n a(n)
0 1
1 1
2 2
3 5
4 18
5 89
6 523
7 3599
8 28342
9 251532
10 2483877
11 27012163
12 320769441
13 4129906549
14 57302453361
15 852373993744
16 13531437150692
17 228343001917932
18 4081631159283027
19 77040788131467135
20 1531185664112909315

[1,1,2,5,18,89,523,3599,28342,251532,2483877,
 27012163,320769441,4129906549,57302453361,
 852373993744,13531437150692,228343001917932,
 4081631159283027,77040788131467135,
 1531185664112909315]

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Last modified July 26 22:49 EDT 2021. Contains 346300 sequences. (Running on oeis4.)