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A083881 as a simple table

n a(n)
0 1
1 3
2 12
3 54
4 252
5 1188
6 5616
7 26568
8 125712
9 594864
10 2814912
11 13320288
12 63032256
13 298271808
14 1411437312
15 6678993024
16 31605334272
17 149558047488
18 707716279296
19 3348949390848
20 15847398669312
21 74990695670784
22 354859782008832

[1,3,12,54,252,1188,5616,26568,125712,594864,
 2814912,13320288,63032256,298271808,1411437312,
 6678993024,31605334272,149558047488,707716279296,
 3348949390848,15847398669312,74990695670784,
 354859782008832]

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Last modified June 6 01:16 EDT 2020. Contains 334858 sequences. (Running on oeis4.)