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A128933 as a simple table

n a(n)
1 2
2 4
3 10
4 28
5 70
6 430
7 1060
8 56500
9 166840
10 5020060
11 7681810
12 274343590
13 8316187180 

[2,4,10,28,70,430,1060,56500,166840,5020060,
 7681810,274343590,8316187180]

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Last modified May 22 20:08 EDT 2022. Contains 353957 sequences. (Running on oeis4.)