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A090959 as a simple table

n a(n)
1 2
2 4
3 12
4 41
5 173
6 679
7 2806
8 11221
9 46200
10 195762
11 797388
12 3338052
13 13821332
14 56256665
15 230808795 

[2,4,12,41,173,679,2806,11221,46200,195762,797388,
 3338052,13821332,56256665,230808795]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)