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A137697 as a simple table

n a(n)
0 1
1 2
2 4
3 20
4 56
5 336
6 1056
7 6864
8 22880
9 155584
10 537472
11 3762304
12 13312768
13 95091200
14 342328320
15 2481880320
16 9051563520
17 66378132480

[1,2,4,20,56,336,1056,6864,22880,155584,537472,
 3762304,13312768,95091200,342328320,2481880320,
 9051563520,66378132480]

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Last modified October 16 00:50 EDT 2018. Contains 316252 sequences. (Running on oeis4.)