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A122595 as a simple table

n a(n)
1 1
2 3
3 8
4 20
5 50
6 125
7 313
8 784
9 1964
10 4920
11 12325
12 30875
13 77344
14 193752
15 485362
16 1215865
17 3045825
18 7630000
19 19113672
20 47881056
21 119945321
22 300471235
23 752701000
24 1885567500
25 4723475586
26 11832629493
27 29641546393
28 74254101600

[1,3,8,20,50,125,313,784,1964,4920,12325,30875,
 77344,193752,485362,1215865,3045825,7630000,
 19113672,47881056,119945321,300471235,752701000,
 1885567500,4723475586,11832629493,29641546393,
 74254101600]

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Last modified June 13 10:10 EDT 2021. Contains 344981 sequences. (Running on oeis4.)