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A237913 as a simple table

n a(n)
1 2
2 4
3 8
4 88
5 252
6 2576
7 21708
8 2112
9 4224
10 8448
11 44544
12 48384
13 2977792
14 21989376
15 405504
16 4091904
17 441606144
18 405909504
19 886898688
20 677707776
21 4285005824

[2,4,8,88,252,2576,21708,2112,4224,8448,44544,
 48384,2977792,21989376,405504,4091904,441606144,
 405909504,886898688,677707776,4285005824]

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Last modified September 28 20:34 EDT 2022. Contains 357081 sequences. (Running on oeis4.)