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A002297 as a simple table

n a(n)
1 1
2 1
3 3
4 2
5 115
6 11
7 5887
8 151
9 259723
10 15619
11 381773117
12 655177
13 20646903199
14 27085381
15 467168310097
16 2330931341
17 75920439315929441
18 12157712239
19 5278968781483042969
20 37307713155613
21 9093099984535515162569
22 339781108897078469
23 168702835448329388944396777

[1,1,3,2,115,11,5887,151,259723,15619,381773117,
 655177,20646903199,27085381,467168310097,
 2330931341,75920439315929441,12157712239,
 5278968781483042969,37307713155613,
 9093099984535515162569,339781108897078469,
 168702835448329388944396777]

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Last modified December 13 17:17 EST 2019. Contains 329970 sequences. (Running on oeis4.)