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A019020 as a simple table

n a(n)
2 2
3 6
4 36
5 150
6 938
7 5968
8 36762
9 235074
10 1553854
11 10377280
12 70137652
13 479982854
14 3319376006
15 23157283294
16 162789085594 

[2,6,36,150,938,5968,36762,235074,1553854,
 10377280,70137652,479982854,3319376006,
 23157283294,162789085594]

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)