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A006213 as a simple table

n a(n)
0 0
1 2
2 10
3 46
4 224
5 1202
6 7120
7 46366
8 329984
9 2551202
10 21306880
11 191252686
12 1836652544
13 18793429202
14 204154071040
15 2346705139006
16 28459289083904
17 363156549211202
18 4864231397785600
19 68237760828425326
20 1000569392347480064
21 15306487540377673202

[0,2,10,46,224,1202,7120,46366,329984,2551202,
 21306880,191252686,1836652544,18793429202,
 204154071040,2346705139006,28459289083904,
 363156549211202,4864231397785600,
 68237760828425326,1000569392347480064,
 15306487540377673202]

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Last modified April 5 23:18 EDT 2020. Contains 333260 sequences. (Running on oeis4.)