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A005442 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 120
5 960
6 9360
7 105840
8 1370880
9 19958400
10 322963200
11 5748019200
12 111607372800
13 2347586841600
14 53178757632000
15 1290674601216000
16 33413695451136000
17 919096314200064000
18 26768324463648768000

[1,1,4,18,120,960,9360,105840,1370880,19958400,
 322963200,5748019200,111607372800,2347586841600,
 53178757632000,1290674601216000,33413695451136000,
 919096314200064000,26768324463648768000]

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Last modified July 24 05:05 EDT 2021. Contains 346273 sequences. (Running on oeis4.)