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A299926 as a simple table

n a(n)
1 1
2 4
3 14
4 60
5 252
6 1212
7 5880
8 30904
9 166976
10 952456
11 5587840
12 34217216
13 215204960
14 1401551376
15 9360467760
16 64384034784
17 453328282624
18 3274696185568
19 24173219998912
20 182546586425408

[1,4,14,60,252,1212,5880,30904,166976,952456,
 5587840,34217216,215204960,1401551376,9360467760,
 64384034784,453328282624,3274696185568,
 24173219998912,182546586425408]

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Last modified February 25 21:00 EST 2020. Contains 332258 sequences. (Running on oeis4.)