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A221401 as a simple table

n a(n)
1 0
2 1
3 6
4 56
5 324
6 2196
7 13328
8 83680
9 512752
10 3161248
11 19384848
12 118981520
13 729388016
14 4471790032
15 27407876144
16 167983235088
17 1029494729904
18 6309251897744
19 38665450224432
20 236955187985936
21 1452135101851056

[0,1,6,56,324,2196,13328,83680,512752,3161248,
 19384848,118981520,729388016,4471790032,
 27407876144,167983235088,1029494729904,
 6309251897744,38665450224432,236955187985936,
 1452135101851056]

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Last modified May 4 15:39 EDT 2024. Contains 372254 sequences. (Running on oeis4.)