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A053529 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 120
5 840
6 7920
7 75600
8 887040
9 10886400
10 152409600
11 2235340800
12 36883123200
13 628929100800
14 11769069312000
15 230150688768000
16 4833164464128000
17 105639166144512000
18 2464913876705280000
19 59606099200327680000
20 1525429559126753280000
21 40464026199993876480000

[1,1,4,18,120,840,7920,75600,887040,10886400,
 152409600,2235340800,36883123200,628929100800,
 11769069312000,230150688768000,4833164464128000,
 105639166144512000,2464913876705280000,
 59606099200327680000,1525429559126753280000,
 40464026199993876480000]

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Last modified May 14 17:50 EDT 2024. Contains 372533 sequences. (Running on oeis4.)