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A300989 as a simple table

n a(n)
1 1
2 1
3 6
4 50
5 520
6 6312
7 86080
8 1288704
9 20862720
10 361454720
11 6652338176
12 129341001216
13 2645494627328
14 56734280221696
15 1272300911597568
16 29769957834147840
17 725430667245355008
18 18379623419316338688
19 483476314203202945024
20 13187069277429966733312
21 372512001057014648537088
22 10886129458069912361631744
23 328776894530826384975593472

[1,1,6,50,520,6312,86080,1288704,20862720,
 361454720,6652338176,129341001216,2645494627328,
 56734280221696,1272300911597568,29769957834147840,
 725430667245355008,18379623419316338688,
 483476314203202945024,13187069277429966733312,
 372512001057014648537088,
 10886129458069912361631744,
 328776894530826384975593472]

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Last modified April 14 19:32 EDT 2021. Contains 342951 sequences. (Running on oeis4.)