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A138912 as a simple table

n a(n)
0 1
1 1
2 2
3 9
4 28
5 145
6 726
7 4249
8 27000
9 186561
10 1387450
11 11034001
12 93295236
13 834720913
14 7870851366
15 77943848025
16 808159323376
17 8749874083585
18 98687599614450
19 1157060036429857
20 14075106913366140
21 177337182574590801

[1,1,2,9,28,145,726,4249,27000,186561,1387450,
 11034001,93295236,834720913,7870851366,
 77943848025,808159323376,8749874083585,
 98687599614450,1157060036429857,14075106913366140,
 177337182574590801]

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Last modified October 2 01:30 EDT 2022. Contains 357191 sequences. (Running on oeis4.)