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A143891
as a simple table
n
a(n)
0
1
1
2
2
1
3
5
4
2
5
15
6
7
7
68
8
23
9
370
10
104
11
2649
12
571
13
25209
14
4176
15
313503
16
39827
17
5212881
18
500254
19
114569731
20
8348616
[1,2,1,5,2,15,7,68,23,370,104,2649,571,25209,4176, 313503,39827,5212881,500254,114569731,8348616]
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Last modified September 16 20:53 EDT 2024. Contains 375977 sequences. (Running on oeis4.)