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A000033 as a simple table

n a(n)
1 0
2 2
3 3
4 4
5 40
6 210
7 1477
8 11672
9 104256
10 1036050
11 11338855
12 135494844
13 1755206648
14 24498813794
15 366526605705
16 5851140525680
17 99271367764480
18 1783734385752162
19 33837677493828171
20 675799125332580020
21 14173726082929399560
22 311462297063636041906

[0,2,3,4,40,210,1477,11672,104256,1036050,
 11338855,135494844,1755206648,24498813794,
 366526605705,5851140525680,99271367764480,
 1783734385752162,33837677493828171,
 675799125332580020,14173726082929399560,
 311462297063636041906]

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Last modified October 15 15:20 EDT 2018. Contains 316236 sequences. (Running on oeis4.)