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A374982 as a simple table

n a(n)
0 1
1 4
2 16
3 80
4 480
5 3840
6 42240
7 675840
8 16220160
9 600145920
10 34808463360
11 3202378629120
12 470749658480640
13 111096919401431040
14 42216829372543795200
15 25878916405369346457600
16 25620127241315652993024000
17 40992203586105044788838400000

[1,4,16,80,480,3840,42240,675840,16220160,
 600145920,34808463360,3202378629120,
 470749658480640,111096919401431040,
 42216829372543795200,25878916405369346457600,
 25620127241315652993024000,
 40992203586105044788838400000]

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Last modified August 10 14:27 EDT 2024. Contains 375056 sequences. (Running on oeis4.)