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A000140 as a simple table

n a(n)
1 1
2 1
3 2
4 6
5 22
6 101
7 573
8 3836
9 29228
10 250749
11 2409581
12 25598186
13 296643390
14 3727542188
15 50626553988
16 738680521142
17 11501573822788
18 190418421447330
19 3344822488498265
20 62119523114983224
21 1214967840930909302

[1,1,2,6,22,101,573,3836,29228,250749,2409581,
 25598186,296643390,3727542188,50626553988,
 738680521142,11501573822788,190418421447330,
 3344822488498265,62119523114983224,
 1214967840930909302]

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Last modified March 20 05:45 EDT 2019. Contains 321344 sequences. (Running on oeis4.)