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A170930 as a simple table

n a(n)
0 0
1 21
2 63
3 252
4 945
5 3591
6 13608
7 51597
8 195615
9 741636
10 2811753
11 10660167
12 40415760
13 153227781
14 580930623
15 2202475212
16 8350217505
17 31658078151
18 120024886968
19 455048895357
20 1725221346975
21 6540810726996
22 24798096221913

[0,21,63,252,945,3591,13608,51597,195615,741636,
 2811753,10660167,40415760,153227781,580930623,
 2202475212,8350217505,31658078151,120024886968,
 455048895357,1725221346975,6540810726996,
 24798096221913]

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Last modified March 29 06:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)