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A150840 as a simple table

n a(n)
0 1
1 2
2 8
3 32
4 138
5 604
6 2703
7 12315
8 56663
9 263196
10 1230758
11 5788966
12 27366503
13 129887780
14 618733335
15 2956325427
16 14163969859
17 68023437777
18 327380888885
19 1578644180769
20 7625361651529
21 36890862105021
22 178729294951629
23 867041001587589
24 4211192195399009
25 20476247078858780
26 99664557968320422

[1,2,8,32,138,604,2703,12315,56663,263196,1230758,
 5788966,27366503,129887780,618733335,2956325427,
 14163969859,68023437777,327380888885,
 1578644180769,7625361651529,36890862105021,
 178729294951629,867041001587589,4211192195399009,
 20476247078858780,99664557968320422]

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Last modified December 1 12:40 EST 2021. Contains 349429 sequences. (Running on oeis4.)