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A020052 as a simple table

n a(n)
0 1
1 0
2 1
3 3
4 12
5 60
6 345
7 2325
8 17972
9 156848
10 1525707
11 16366684
12 191936576
13 2442829156
14 33533382055
15 493855262996
16 7766996408941
17 129920667204109
18 2303139100436492
19 43131514062719762
20 850867141055471683

[1,0,1,3,12,60,345,2325,17972,156848,1525707,
 16366684,191936576,2442829156,33533382055,
 493855262996,7766996408941,129920667204109,
 2303139100436492,43131514062719762,
 850867141055471683]

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Last modified April 16 10:22 EDT 2021. Contains 343036 sequences. (Running on oeis4.)