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A001761 as a simple table

n a(n)
0 1
1 1
2 4
3 30
4 336
5 5040
6 95040
7 2162160
8 57657600
9 1764322560
10 60949324800
11 2346549004800
12 99638080819200
13 4626053752320000
14 233153109116928000
15 12677700308232960000
16 739781100339240960000
17 46113021921146019840000

[1,1,4,30,336,5040,95040,2162160,57657600,
 1764322560,60949324800,2346549004800,
 99638080819200,4626053752320000,
 233153109116928000,12677700308232960000,
 739781100339240960000,46113021921146019840000]

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Last modified February 21 22:56 EST 2018. Contains 299427 sequences. (Running on oeis4.)