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A018913 as a simple table

n a(n)
0 0
1 1
2 9
3 80
4 711
5 6319
6 56160
7 499121
8 4435929
9 39424240
10 350382231
11 3114015839
12 27675760320
13 245967827041
14 2186034683049
15 19428344320400
16 172669064200551
17 1534593233484559
18 13638670037160480
19 121213437100959761

[0,1,9,80,711,6319,56160,499121,4435929,39424240,
 350382231,3114015839,27675760320,245967827041,
 2186034683049,19428344320400,172669064200551,
 1534593233484559,13638670037160480,
 121213437100959761]

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Last modified November 16 20:04 EST 2019. Contains 329202 sequences. (Running on oeis4.)