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A003408 as a simple table

n a(n)
0 1
1 9
2 66
3 455
4 3060
5 20349
6 134596
7 888030
8 5852925
9 38567100
10 254186856
11 1676056044
12 11058116888
13 73006209045
14 482320623240
15 3188675231420
16 21094923659355
17 139646485582065
18 925029565741050
19 6131164307078475
20 40661170824914640
21 269807672771096460

[1,9,66,455,3060,20349,134596,888030,5852925,
 38567100,254186856,1676056044,11058116888,
 73006209045,482320623240,3188675231420,
 21094923659355,139646485582065,925029565741050,
 6131164307078475,40661170824914640,
 269807672771096460]

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Last modified July 25 19:05 EDT 2021. Contains 346291 sequences. (Running on oeis4.)