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A221425 as a simple table

n a(n)
1 1
2 9
3 42
4 217
5 1116
6 5722
7 29383
8 150821
9 774219
10 3974308
11 20401353
12 104726538
13 537593996
14 2759637891
15 14166083083
16 72718928341
17 373288968420
18 1916208848267
19 9836498426064
20 50493818235236
21 259200537583569
22 1330557304472777

[1,9,42,217,1116,5722,29383,150821,774219,3974308,
 20401353,104726538,537593996,2759637891,
 14166083083,72718928341,373288968420,
 1916208848267,9836498426064,50493818235236,
 259200537583569,1330557304472777]

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Last modified August 17 12:30 EDT 2022. Contains 356189 sequences. (Running on oeis4.)