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A019021 as a simple table

n a(n)
2 3
3 7
4 30
5 140
6 908
7 5586
8 35137
9 226799
10 1489781
11 9920319
12 67048694
13 458884910
14 3172523046
15 22127603235
16 155529572271 

[3,7,30,140,908,5586,35137,226799,1489781,9920319,
 67048694,458884910,3172523046,22127603235,
 155529572271]

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Last modified April 20 00:03 EDT 2024. Contains 371798 sequences. (Running on oeis4.)