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A019010 as a simple table

n a(n)
2 2
3 4
4 24
5 156
6 1000
7 5643
8 34982
9 233545
10 1547406
11 10236802
12 68328682
13 462278064
14 3163496690
15 21853935721
16 152252426550

[2,4,24,156,1000,5643,34982,233545,1547406,
 10236802,68328682,462278064,3163496690,
 21853935721,152252426550]

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Last modified July 8 00:40 EDT 2020. Contains 335502 sequences. (Running on oeis4.)