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A221963 as a simple table

n a(n)
1 9
2 81
3 369
4 2241
5 12609
6 73089
7 419841
8 2419713
9 13930497
10 80230401
11 462012417
12 2660655105
13 15322038273
14 88236228609
15 508131934209
16 2926215692289
17 16851403538433
18 97043367329793
19 558850475294721
20 3218291629752321

[9,81,369,2241,12609,73089,419841,2419713,
 13930497,80230401,462012417,2660655105,
 15322038273,88236228609,508131934209,
 2926215692289,16851403538433,97043367329793,
 558850475294721,3218291629752321]

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Last modified September 16 17:39 EDT 2021. Contains 347473 sequences. (Running on oeis4.)