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A225585 as a simple table

n a(n)
1 2
2 4
3 8
4 20
5 48
6 121
7 312
8 820
9 2186
10 5904
11 16104
12 44286
13 122640
14 341640
15 956593
16 2690420
17 7596480
18 21523360
19 61171656
20 174339220
21 498112057
22 1426411800
23 4093181688
24 11767897353
25 33891544377
26 97764070320
27 282429536480
28 817028301962
29 2366564736720

[2,4,8,20,48,121,312,820,2186,5904,16104,44286,
 122640,341640,956593,2690420,7596480,21523360,
 61171656,174339220,498112057,1426411800,
 4093181688,11767897353,33891544377,97764070320,
 282429536480,817028301962,2366564736720]

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Last modified April 16 12:45 EDT 2021. Contains 343037 sequences. (Running on oeis4.)