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A309903 as a simple table

n a(n)
0 0
1 1
2 21
3 71
4 196
5 2071
6 2071
7 33321
8 345821
9 736446
10 8548946
11 18314571
12 18314571
13 994877071
14 994877071
15 25408939571
16 86444095821
17 239031986446
18 1001971439571
19 16260760502071
20 92554705814571
21 283289569095821
22 1236963885502071
23 8389521258548946

[0,1,21,71,196,2071,2071,33321,345821,736446,
 8548946,18314571,18314571,994877071,994877071,
 25408939571,86444095821,239031986446,
 1001971439571,16260760502071,92554705814571,
 283289569095821,1236963885502071,8389521258548946]

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Last modified June 25 00:34 EDT 2021. Contains 345445 sequences. (Running on oeis4.)