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A229009 as a simple table

n a(n)
1 6
2 34
3 186
4 794
5 3002
6 10860
7 38768
8 139456
9 506236
10 1849846
11 6780968
12 24874236
13 91221120
14 334365156
15 1225151856
16 4488311694
17 16442040398
18 60232977210
19 220660283800
20 808393136582
21 2961592442222
22 10849984832400
23 39749595896184

[6,34,186,794,3002,10860,38768,139456,506236,
 1849846,6780968,24874236,91221120,334365156,
 1225151856,4488311694,16442040398,60232977210,
 220660283800,808393136582,2961592442222,
 10849984832400,39749595896184]

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Last modified December 4 16:41 EST 2022. Contains 358563 sequences. (Running on oeis4.)