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A156809 as a simple table

n a(n)
1 1
2 2
3 4
4 11
5 34
6 154
7 978
8 9497
9 127954
10 2165291
11 42609994
12 937233306
13 22576188846 

[1,2,4,11,34,154,978,9497,127954,2165291,42609994,
 937233306,22576188846]

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Last modified April 24 02:28 EDT 2024. Contains 371917 sequences. (Running on oeis4.)