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A151987 as a simple table

n a(n)
0 1
1 1
2 3
3 13
4 64
5 404
6 2135
7 21077
8 111459
9 1261637
10 10767866
11 111804384
12 659105457
13 18705101130

[1,1,3,13,64,404,2135,21077,111459,1261637,
 10767866,111804384,659105457,18705101130]

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Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)