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A177518 as a simple table

n a(n)
1 1
2 2
3 6
4 24
5 116
6 672
7 4536
8 34944
9 302896
10 2916992
11 30899616
12 357080064
13 4470310976
14 60269056512
15 870591770496
16 13414154256384
17 219604379097856
18 3806644208863232
19 69650568655858176
20 1341477655028219904
21 27128858382696129536
22 574755293400886321152

[1,2,6,24,116,672,4536,34944,302896,2916992,
 30899616,357080064,4470310976,60269056512,
 870591770496,13414154256384,219604379097856,
 3806644208863232,69650568655858176,
 1341477655028219904,27128858382696129536,
 574755293400886321152]

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Last modified September 22 00:42 EDT 2020. Contains 337276 sequences. (Running on oeis4.)