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A034216 as a simple table

n a(n)
0 1
1 1
2 4
3 20
4 144
5 1245
6 12473
7 120213
8 1067757
9 8508432
10 60801152
11 391078610
12 2277606189
13 12079172109
14 58646808981
15 261900799332
16 1080219903328
17 4129996450120
18 14683917874810
19 48687786994190
20 150930310833366

[1,1,4,20,144,1245,12473,120213,1067757,8508432,
 60801152,391078610,2277606189,12079172109,
 58646808981,261900799332,1080219903328,
 4129996450120,14683917874810,48687786994190,
 150930310833366]

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Last modified October 19 15:34 EDT 2021. Contains 348091 sequences. (Running on oeis4.)