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A153939 as a simple table

n a(n)
0 1
1 2
2 4
3 15
4 59
5 432
6 3332
7 48304
8 732710
9 20860338
10 622243455
11 34837075520
12 2043323102439
13 224967044124824
14 25947204334949263
15 5617471553259441802
16 1274053481965034919451
17 542391484462533633238628

[1,2,4,15,59,432,3332,48304,732710,20860338,
 622243455,34837075520,2043323102439,
 224967044124824,25947204334949263,
 5617471553259441802,1274053481965034919451,
 542391484462533633238628]

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Last modified May 9 13:09 EDT 2021. Contains 343742 sequences. (Running on oeis4.)