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A057834 as a simple table

n a(n)
1 4
2 22
3 145
4 1086
5 8686
6 72382
7 620421
8 5428681
9 48254942
10 434294482
11 3948131654
12 36191206825
13 334072678387
14 3102103442166
15 28952965460217
16 271434051189532
17 2554673422960305
18 24127471216847324
19 228576043106974646

[4,22,145,1086,8686,72382,620421,5428681,48254942,
 434294482,3948131654,36191206825,334072678387,
 3102103442166,28952965460217,271434051189532,
 2554673422960305,24127471216847324,
 228576043106974646]

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Last modified May 31 12:48 EDT 2020. Contains 334748 sequences. (Running on oeis4.)