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A003287 as a simple table

n a(n)
1 1
2 4
3 22
4 140
5 970
6 7196
7 56092
8 452064
9 3735700
10 31484244
11 269613896
12 2339571468
13 20529434520
14 181871459580
15 1624587752400
16 14617165101216

[1,4,22,140,970,7196,56092,452064,3735700,
 31484244,269613896,2339571468,20529434520,
 181871459580,1624587752400,14617165101216]

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Last modified March 29 10:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)