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A138909 as a simple table

n a(n)
0 1
1 2
2 6
3 33
4 232
5 2045
6 21636
7 267043
8 3766848
9 59776137
10 1053986500
11 20442543671
12 432537117552
13 9914571191005
14 244742376434388
15 6473030199939675
16 182614314495736576
17 5473825396372806545
18 173728330742517310980

[1,2,6,33,232,2045,21636,267043,3766848,59776137,
 1053986500,20442543671,432537117552,9914571191005,
 244742376434388,6473030199939675,
 182614314495736576,5473825396372806545,
 173728330742517310980]

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Last modified August 10 04:49 EDT 2022. Contains 356029 sequences. (Running on oeis4.)