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A012509 as a simple table

n a(n)
0 0
1 2
2 4
3 32
4 544
5 15872
6 707584
7 44736512
8 3807514624
9 419730685952
10 58177770225664
11 9902996106248192
12 2030847773013704704
13 493842960380415967232
14 140503203207887919775744
15 46238368375619195682947072
16 17427925514250338592341622784
17 7458815407441059142195019251712

[0,2,4,32,544,15872,707584,44736512,3807514624,
 419730685952,58177770225664,9902996106248192,
 2030847773013704704,493842960380415967232,
 140503203207887919775744,
 46238368375619195682947072,
 17427925514250338592341622784,
 7458815407441059142195019251712]

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Last modified October 22 22:58 EDT 2018. Contains 316518 sequences. (Running on oeis4.)