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A320349 as a simple table

n a(n)
0 1
1 1
2 5
3 32
4 278
5 2894
6 35986
7 514128
8 8306448
9 149558688
10 2968216944
11 64314676128
12 1510065781968
13 38178537908016
14 1033794746169168
15 29840453678758272
16 914461132860063360
17 29645845798652997120
18 1013511411165693991680
19 36436289007997132646400
20 1373976152501162688288000

[1,1,5,32,278,2894,35986,514128,8306448,149558688,
 2968216944,64314676128,1510065781968,
 38178537908016,1033794746169168,29840453678758272,
 914461132860063360,29645845798652997120,
 1013511411165693991680,36436289007997132646400,
 1373976152501162688288000]

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Last modified January 26 14:08 EST 2020. Contains 331280 sequences. (Running on oeis4.)