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A002299 as a simple table

n a(n)
0 1
1 21
2 126
3 462
4 1287
5 3003
6 6188
7 11628
8 20349
9 33649
10 53130
11 80730
12 118755
13 169911
14 237336
15 324632
16 435897
17 575757
18 749398
19 962598
20 1221759
21 1533939
22 1906884
23 2349060
24 2869685
25 3478761
26 4187106
27 5006386
28 5949147
29 7028847
30 8259888
31 9657648
32 11238513

[1,21,126,462,1287,3003,6188,11628,20349,33649,
 53130,80730,118755,169911,237336,324632,435897,
 575757,749398,962598,1221759,1533939,1906884,
 2349060,2869685,3478761,4187106,5006386,5949147,
 7028847,8259888,9657648,11238513]

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Last modified June 19 13:05 EDT 2021. Contains 345129 sequences. (Running on oeis4.)