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A153390 as a simple table

n a(n)
0 1
1 2
2 9
3 48
4 278
5 1696
6 10736
7 69886
8 465019
9 3149476
10 21643433
11 150554144
12 1058101315
13 7502183626
14 53599160532
15 385494328218
16 2788827078507
17 20280590381098
18 148167425970522
19 1087007419753186
20 8004683588800899

[1,2,9,48,278,1696,10736,69886,465019,3149476,
 21643433,150554144,1058101315,7502183626,
 53599160532,385494328218,2788827078507,
 20280590381098,148167425970522,1087007419753186,
 8004683588800899]

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Last modified September 28 17:19 EDT 2020. Contains 337393 sequences. (Running on oeis4.)