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A239630 as a simple table

n a(n)
1 2
2 5
3 10
4 30
5 130
6 390
7 2210
8 6630
9 46410
10 192270
11 1345890
12 7113990
13 49797930
14 291673590
15 2041715130 

[2,5,10,30,130,390,2210,6630,46410,192270,1345890,
 7113990,49797930,291673590,2041715130]

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Last modified April 23 12:44 EDT 2024. Contains 371913 sequences. (Running on oeis4.)