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A026639 as a simple table

n a(n)
1 1
2 5
3 20
4 74
5 278
6 1049
7 3980
8 15170
9 58052
10 222914
11 858512
12 3314960
13 12829070
14 49748705
15 193259660
16 751954250
17 2929965020
18 11431262390
19 44651369720
20 174597927740
21 683388447260
22 2677230376490
23 10496941482680
24 41188078562324

[1,5,20,74,278,1049,3980,15170,58052,222914,
 858512,3314960,12829070,49748705,193259660,
 751954250,2929965020,11431262390,44651369720,
 174597927740,683388447260,2677230376490,
 10496941482680,41188078562324]

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Last modified June 28 04:00 EDT 2022. Contains 354903 sequences. (Running on oeis4.)