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A002851 as a simple table

n a(n)
0 1
1 0
2 1
3 2
4 5
5 19
6 85
7 509
8 4060
9 41301
10 510489
11 7319447
12 117940535
13 2094480864
14 40497138011
15 845480228069
16 18941522184590
17 453090162062723
18 11523392072541432
19 310467244165539782
20 8832736318937756165

[1,0,1,2,5,19,85,509,4060,41301,510489,7319447,
 117940535,2094480864,40497138011,845480228069,
 18941522184590,453090162062723,11523392072541432,
 310467244165539782,8832736318937756165]

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Last modified April 16 03:25 EDT 2021. Contains 343030 sequences. (Running on oeis4.)