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A109156 as a simple table

n a(n)
0 1
1 2
2 5
3 14
4 47
5 188
6 867
7 4460
8 25025
9 150890
10 967825
11 6554482
12 46600855
13 346228012
14 2677951311
15 21495038944
16 178565654041
17 1531692226714
18 13538763090277
19 123096619532030
20 1149440819867767
21 11007471611129700

[1,2,5,14,47,188,867,4460,25025,150890,967825,
 6554482,46600855,346228012,2677951311,21495038944,
 178565654041,1531692226714,13538763090277,
 123096619532030,1149440819867767,
 11007471611129700]

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Last modified August 7 12:19 EDT 2020. Contains 336276 sequences. (Running on oeis4.)