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A020107 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 3
5 13
6 68
7 426
8 3103
9 25751
10 239484
11 2466678
12 27873457
13 342843515
14 4559818741
15 65205407995
16 997642742322
17 16261576699845
18 281325276907304
19 5148252567403659
20 99361274550890614
21 2017033873383079454

[1,1,1,1,3,13,68,426,3103,25751,239484,2466678,
 27873457,342843515,4559818741,65205407995,
 997642742322,16261576699845,281325276907304,
 5148252567403659,99361274550890614,
 2017033873383079454]

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Last modified May 7 19:23 EDT 2021. Contains 343652 sequences. (Running on oeis4.)