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A020110 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 15
5 70
6 401
7 2715
8 21116
9 185346
10 1812264
11 19532171
12 230045569
13 2939471158
14 40499380397
15 598490843643
16 9442855533027
17 158430131720784
18 2816535675036147
19 52888281009012093
20 1046012668844905827

[1,1,2,4,15,70,401,2715,21116,185346,1812264,
 19532171,230045569,2939471158,40499380397,
 598490843643,9442855533027,158430131720784,
 2816535675036147,52888281009012093,
 1046012668844905827]

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Last modified May 12 21:21 EDT 2021. Contains 343829 sequences. (Running on oeis4.)