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A208040 as a simple table

n a(n)
1 9
2 81
3 279
4 961
5 4743
6 23409
7 100215
8 429025
9 1942075
10 8791225
11 38933415
12 172423161
13 770225067
14 3440643649
15 15317395695
16 68191488225
17 303989603715
18 1355149763881
19 6037892299063
20 26901929503849
21 119887169037291

[9,81,279,961,4743,23409,100215,429025,1942075,
 8791225,38933415,172423161,770225067,3440643649,
 15317395695,68191488225,303989603715,
 1355149763881,6037892299063,26901929503849,
 119887169037291]

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Last modified February 2 21:10 EST 2023. Contains 360024 sequences. (Running on oeis4.)