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A327872 as a simple table

n a(n)
0 1
1 4
2 21
3 148
4 980
5 6444
6 41888
7 270088
8 1730079
9 11023480
10 69930146
11 441988260
12 2784820519
13 17499028820
14 109701885600
15 686313858480
16 4285914086100
17 26721615383496
18 166361793070466
19 1034375862301240
20 6423778211164860
21 39850734775066644
22 246976735839649218

[1,4,21,148,980,6444,41888,270088,1730079,
 11023480,69930146,441988260,2784820519,
 17499028820,109701885600,686313858480,
 4285914086100,26721615383496,166361793070466,
 1034375862301240,6423778211164860,
 39850734775066644,246976735839649218]

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Last modified December 9 13:50 EST 2019. Contains 329877 sequences. (Running on oeis4.)