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A001909 as a simple table

n a(n)
2 0
3 1
4 4
5 21
6 134
7 1001
8 8544
9 81901
10 870274
11 10146321
12 128718044
13 1764651461
14 25992300894
15 409295679481
16 6860638482424
17 121951698034461
18 2291179503374234
19 45361686034627361
20 943892592746534964
21 20592893110265899381
22 470033715095287415734

[0,1,4,21,134,1001,8544,81901,870274,10146321,
 128718044,1764651461,25992300894,409295679481,
 6860638482424,121951698034461,2291179503374234,
 45361686034627361,943892592746534964,
 20592893110265899381,470033715095287415734]

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Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)