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A153942 as a simple table

n a(n)
0 1
1 2
2 4
3 15
4 38
5 236
6 1250
7 13966
8 128542
9 2461620
10 40144584
11 1355506385
12 38359079886
13 2280018933124
14 113583264552803
15 11849601571255761
16 1037356176207581620
17 189822553366119038561

[1,2,4,15,38,236,1250,13966,128542,2461620,
 40144584,1355506385,38359079886,2280018933124,
 113583264552803,11849601571255761,
 1037356176207581620,189822553366119038561]

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Last modified December 9 07:10 EST 2023. Contains 367689 sequences. (Running on oeis4.)