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A122877 as a simple table

n a(n)
0 0
1 1
2 2
3 7
4 20
5 65
6 206
7 679
8 2248
9 7569
10 25690
11 88055
12 303964
13 1056497
14 3693158
15 12977655
16 45813008
17 162400609
18 577843890
19 2063053991
20 7388487460
21 26535797729
22 95552015614
23 344897769991
24 1247685613272

[0,1,2,7,20,65,206,679,2248,7569,25690,88055,
 303964,1056497,3693158,12977655,45813008,
 162400609,577843890,2063053991,7388487460,
 26535797729,95552015614,344897769991,
 1247685613272]

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Last modified September 30 23:33 EDT 2020. Contains 337440 sequences. (Running on oeis4.)