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A003019 as a simple table

n a(n)
1 1
2 1
3 2
4 4
5 9
6 20
7 48
8 114
9 282
10 703
11 1787
12 4583
13 11900
14 31131
15 82117
16 217954
17 581970
18 1561704
19 4210263
20 11396488
21 30963024
22 84402984
23 230779071
24 632762424
25 1739387089 

[1,1,2,4,9,20,48,114,282,703,1787,4583,11900,
 31131,82117,217954,581970,1561704,4210263,
 11396488,30963024,84402984,230779071,632762424,
 1739387089]

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Last modified April 19 02:12 EDT 2024. Contains 371782 sequences. (Running on oeis4.)