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A222993 as a simple table

n a(n)
1 9
2 50
3 222
4 867
5 3123
6 10660
7 35064
8 112373
9 353517
10 1097430
11 3374226
12 10302919
13 31301991
14 94757960
15 286108908
16 862258905
17 2595165345
18 7803321850
19 23447714310
20 70422834731
21 211436276379
22 634661150700
23 1904721649632
24 5715708452797

[9,50,222,867,3123,10660,35064,112373,353517,
 1097430,3374226,10302919,31301991,94757960,
 286108908,862258905,2595165345,7803321850,
 23447714310,70422834731,211436276379,634661150700,
 1904721649632,5715708452797]

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Last modified January 24 08:16 EST 2022. Contains 350534 sequences. (Running on oeis4.)