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A136660 as a simple table

n a(n)
0 1
1 18
2 255
3 3465
4 47880
5 687960
6 10372320
7 164656800
8 2754259200
9 48518870400
10 899026128000
11 17495593315200
12 356995102464000
13 7625049239808000
14 170196434343936000
15 3963602854987776000
16 96160451873181696000

[1,18,255,3465,47880,687960,10372320,164656800,
 2754259200,48518870400,899026128000,
 17495593315200,356995102464000,7625049239808000,
 170196434343936000,3963602854987776000,
 96160451873181696000]

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Last modified June 5 09:58 EDT 2020. Contains 334836 sequences. (Running on oeis4.)