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A003018 as a simple table

n a(n)
1 1
2 1
3 2
4 4
5 9
6 20
7 47
8 111
9 270
10 664
11 1659
12 4184
13 10662
14 27367
15 70747
16 183925
17 480656
18 1261630
19 3324772
20 8792592
21 23327249
22 62067785
23 165586565

[1,1,2,4,9,20,47,111,270,664,1659,4184,10662,
 27367,70747,183925,480656,1261630,3324772,8792592,
 23327249,62067785,165586565]

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Last modified May 24 17:42 EDT 2018. Contains 304533 sequences. (Running on oeis4.)