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A166748 as a simple table

n a(n)
0 1
1 6
2 36
3 222
4 1440
5 9990
6 74880
7 609390
8 5391360
9 51798150
10 539136000
11 6060383550
12 73322496000
13 951480217350
14 13198049280000
15 195053444556750
16 3061947432960000
17 50908949029311750
18 894088650424320000

[1,6,36,222,1440,9990,74880,609390,5391360,
 51798150,539136000,6060383550,73322496000,
 951480217350,13198049280000,195053444556750,
 3061947432960000,50908949029311750,
 894088650424320000]

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Last modified April 12 21:13 EDT 2021. Contains 342932 sequences. (Running on oeis4.)