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A034770 as a simple table

n a(n)
1 1
2 2
3 4
4 11
5 30
6 108
7 406
8 1764
9 8284
10 42324
11 231950
12 1357264
13 8427194
14 55289280
15 381798704
16 2765918869
17 20960284294
18 165729748096
19 1364153612318
20 11665484452558
21 103448316471556
22 949739632545452
23 9013431476894646

[1,2,4,11,30,108,406,1764,8284,42324,231950,
 1357264,8427194,55289280,381798704,2765918869,
 20960284294,165729748096,1364153612318,
 11665484452558,103448316471556,949739632545452,
 9013431476894646]

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Last modified September 27 16:31 EDT 2021. Contains 347692 sequences. (Running on oeis4.)