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A001471 as a simple table

n a(n)
0 0
1 0
2 0
3 2
4 8
5 20
6 80
7 350
8 1232
9 5768
10 31040
11 142010
12 776600
13 4874012
14 27027728
15 168369110
16 1191911840
17 7678566800
18 53474964992
19 418199988338
20 3044269834280
21 23364756531620
22 199008751634000
23 1605461415071822

[0,0,0,2,8,20,80,350,1232,5768,31040,142010,
 776600,4874012,27027728,168369110,1191911840,
 7678566800,53474964992,418199988338,3044269834280,
 23364756531620,199008751634000,1605461415071822]

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Last modified February 16 21:22 EST 2019. Contains 320199 sequences. (Running on oeis4.)