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A223922 as a simple table

n a(n)
1 21
2 441
3 5548
4 48182
5 319156
6 1721356
7 7906972
8 31947798
9 116289938
10 388293504
11 1205901516
12 3520937666
13 9746278721
14 25746339006
15 65246565981
16 159287861727
17 375892787585
18 859832700375
19 1910938878762
20 4134527627922
21 8723666100444

[21,441,5548,48182,319156,1721356,7906972,
 31947798,116289938,388293504,1205901516,
 3520937666,9746278721,25746339006,65246565981,
 159287861727,375892787585,859832700375,
 1910938878762,4134527627922,8723666100444]

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Last modified May 20 06:37 EDT 2022. Contains 353852 sequences. (Running on oeis4.)