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A213297 as a simple table

n a(n)
0 1
1 9
2 81
3 621
4 4293
5 26061
6 140517
7 676155
8 2990967
9 12602451
10 52359693
11 216954441
12 901911273
13 3778512489
14 16012113225
15 68739345546
16 299377174968
17 1323228682218
18 5939020708851
19 27063683050245
20 125241936884631
21 588324477445971
22 2805460966739493

[1,9,81,621,4293,26061,140517,676155,2990967,
 12602451,52359693,216954441,901911273,3778512489,
 16012113225,68739345546,299377174968,
 1323228682218,5939020708851,27063683050245,
 125241936884631,588324477445971,2805460966739493]

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Last modified January 19 22:12 EST 2022. Contains 350466 sequences. (Running on oeis4.)