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A019928 as a simple table

n a(n)
0 1
1 20
2 269
3 3040
4 31161
5 300300
6 2775109
7 24887960
8 218303921
9 1882786180
10 16026538749
11 135010883280
12 1127921219881
13 9359429537660
14 77233958267189
15 634411837477000
16 5191228487083041
17 42342127346986740

[1,20,269,3040,31161,300300,2775109,24887960,
 218303921,1882786180,16026538749,135010883280,
 1127921219881,9359429537660,77233958267189,
 634411837477000,5191228487083041,
 42342127346986740]

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Last modified April 18 22:08 EDT 2019. Contains 322237 sequences. (Running on oeis4.)