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A211889 as a simple table

n a(n)
1 1
2 2
3 6
4 30
5 60
6 244230
7 6930
8 546840
9 3120613860
10 7399357350
11 10719893274090
12 173761834256010
13 14772517344885300

[1,2,6,30,60,244230,6930,546840,3120613860,
 7399357350,10719893274090,173761834256010,
 14772517344885300]

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Last modified July 31 21:28 EDT 2021. Contains 346377 sequences. (Running on oeis4.)