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A027745 as a simple table

n a(n)
0 1
1 4
2 16
3 96
4 640
5 5280
6 27648
7 340704
8 1966080
9 15676416
10 124608000
11 1341648000
12 7166361600
13 97763702400
14 629315721216
15 4680529920000
16 42316647628800
17 483414202656000
18 2396062681399296
19 35513562609100800
20 211942058803200000
21 2006922093666287616
22 16837843397760000000

[1,4,16,96,640,5280,27648,340704,1966080,15676416,
 124608000,1341648000,7166361600,97763702400,
 629315721216,4680529920000,42316647628800,
 483414202656000,2396062681399296,
 35513562609100800,211942058803200000,
 2006922093666287616,16837843397760000000]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)