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A233438 as a simple table

n a(n)
0 0
1 2
2 6
3 30
4 210
5 2310
6 30030
7 510510
8 9699690
9 223092870
10 6469693230
11 200560490130
12 2153462358810
13 72490129383210
14 1958274892758030
15 58665460642891410
16 50035643372444730
17 19221664375883039070
18 1123712842678138983270
19 27456249893723439879090
20 350421246400567367415390

[0,2,6,30,210,2310,30030,510510,9699690,223092870,
 6469693230,200560490130,2153462358810,
 72490129383210,1958274892758030,58665460642891410,
 50035643372444730,19221664375883039070,
 1123712842678138983270,27456249893723439879090,
 350421246400567367415390]

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Last modified September 15 16:33 EDT 2019. Contains 327078 sequences. (Running on oeis4.)