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A106174 as a simple table

n a(n)
0 0
1 1
2 4
3 23
4 180
5 1777
6 21144
7 294239
8 4686680
9 84066001
10 1676633340
11 36801867479
12 881568186156
13 22883970972577
14 639869619046000
15 19173204600407423
16 612902677593991536
17 20819517833595304801
18 748889739331836981300

[0,1,4,23,180,1777,21144,294239,4686680,84066001,
 1676633340,36801867479,881568186156,
 22883970972577,639869619046000,19173204600407423,
 612902677593991536,20819517833595304801,
 748889739331836981300]

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Last modified July 24 11:42 EDT 2021. Contains 346273 sequences. (Running on oeis4.)