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A015580 as a simple table

n a(n)
0 0
1 1
2 9
3 85
4 801
5 7549
6 71145
7 670501
8 6319089
9 59553805
10 561260601
11 5289560629
12 49851088065
13 469818035101
14 4427766668169
15 41729172153925
16 393273616058001
17 3706379233137709
18 34930507562471385
19 329200084994793301
20 3102522795203025249
21 29239505496806400445

[0,1,9,85,801,7549,71145,670501,6319089,59553805,
 561260601,5289560629,49851088065,469818035101,
 4427766668169,41729172153925,393273616058001,
 3706379233137709,34930507562471385,
 329200084994793301,3102522795203025249,
 29239505496806400445]

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Last modified December 16 09:06 EST 2019. Contains 330020 sequences. (Running on oeis4.)