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A003014 as a simple table

n a(n)
0 1
1 1
2 4
3 21
4 124
5 705
6 3726
7 18361
8 85240
9 376641
10 1597690
11 6551721
12 26116740
13 101647585
14 387634534
15 1452554265
16 5360857456
17 19523426433
18 70272302706
19 250318462537
20 883418329660
21 3091835703201
22 10739780397214

[1,1,4,21,124,705,3726,18361,85240,376641,1597690,
 6551721,26116740,101647585,387634534,1452554265,
 5360857456,19523426433,70272302706,250318462537,
 883418329660,3091835703201,10739780397214]

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Last modified December 5 15:11 EST 2019. Contains 329753 sequences. (Running on oeis4.)