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A109155 as a simple table

n a(n)
0 1
1 3
2 6
3 24
4 102
5 516
6 2814
7 16752
8 106026
9 712260
10 5027190
11 37158600
12 286141638
13 2289018708
14 18961164774
15 162271001760
16 1431533922642
17 12994777356228
18 121174578691398
19 1159065402957240
20 11357543381281638
21 113876839666712676

[1,3,6,24,102,516,2814,16752,106026,712260,
 5027190,37158600,286141638,2289018708,18961164774,
 162271001760,1431533922642,12994777356228,
 121174578691398,1159065402957240,
 11357543381281638,113876839666712676]

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Last modified September 24 14:46 EDT 2020. Contains 337321 sequences. (Running on oeis4.)