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A003283 as a simple table

n a(n)
0 1
1 2
2 20
3 70
4 112
5 352
6 1232
7 22880
8 183040
9 1244672
10 30098432
11 72352
12 2472371200
13 115763200
14 441223168
15 6838959104
16 61568122880
17 745298329600
18 28321336524800
19 1103041527808
20 573581594460160
21 4275790067793920
22 49961677422592

[1,2,20,70,112,352,1232,22880,183040,1244672,
 30098432,72352,2472371200,115763200,441223168,
 6838959104,61568122880,745298329600,
 28321336524800,1103041527808,573581594460160,
 4275790067793920,49961677422592]

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Last modified January 28 23:12 EST 2022. Contains 350670 sequences. (Running on oeis4.)