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A021854 as a simple table

n a(n)
0 1
1 20
2 265
3 2940
4 29601
5 280740
6 2558905
7 22683980
8 197048401
9 1685772660
10 14253277545
11 119401486620
12 992861126401
13 8206523123780
14 67497981692185
15 552905862106860
16 4513706683463601
17 36742894880462100

[1,20,265,2940,29601,280740,2558905,22683980,
 197048401,1685772660,14253277545,119401486620,
 992861126401,8206523123780,67497981692185,
 552905862106860,4513706683463601,
 36742894880462100]

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Last modified December 6 22:42 EST 2021. Contains 349567 sequences. (Running on oeis4.)