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A212073 as a simple table

n a(n)
0 1
1 4
2 30
3 280
4 2925
5 32736
6 383838
7 4654320
8 57887550
9 734405100
10 9467075926
11 123648163392
12 1632743088275
13 21761329287600
14 292362576381900
15 3955219615609056
16 53834425161872586
17 736687428853685400
18 10129401435828605700
19 139876690363085200200

[1,4,30,280,2925,32736,383838,4654320,57887550,
 734405100,9467075926,123648163392,1632743088275,
 21761329287600,292362576381900,3955219615609056,
 53834425161872586,736687428853685400,
 10129401435828605700,139876690363085200200]

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Last modified March 19 04:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)