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A000136 as a simple table

n a(n)
1 1
2 2
3 6
4 16
5 50
6 144
7 462
8 1392
9 4536
10 14060
11 46310
12 146376
13 485914
14 1557892
15 5202690
16 16861984
17 56579196
18 184940388
19 622945970
20 2050228360
21 6927964218
22 22930109884
23 77692142980
24 258360586368
25 877395996200
26 2929432171328
27 9968202968958
28 33396290888520
29 113837957337750

[1,2,6,16,50,144,462,1392,4536,14060,46310,146376,
 485914,1557892,5202690,16861984,56579196,
 184940388,622945970,2050228360,6927964218,
 22930109884,77692142980,258360586368,877395996200,
 2929432171328,9968202968958,33396290888520,
 113837957337750]

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Last modified November 21 16:04 EST 2019. Contains 329371 sequences. (Running on oeis4.)