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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 November 11 22:31 EST 2019. Contains 329046 sequences. (Running on oeis4.)