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A015558 as a simple table

n a(n)
1 0
2 1
3 1
4 5
5 21
6 116
7 751
8 5628
9 47811
10 453999
11 4765190
12 54782415
13 684597510
14 9239952802
15 133952757201
16 2075907567336
17 34247231626810
18 599244998013964
19 11084682598687313
20 216127622080213321

[0,1,1,5,21,116,751,5628,47811,453999,4765190,
 54782415,684597510,9239952802,133952757201,
 2075907567336,34247231626810,599244998013964,
 11084682598687313,216127622080213321]

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Last modified June 9 08:50 EDT 2024. Contains 373231 sequences. (Running on oeis4.)