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A109926 as a simple table

n a(n)
0 1
1 3
2 4
3 15
4 21
5 45
6 75
7 465
8 1095
9 2145
10 4935
11 14955
12 80685
13 229845
14 1295325
15 1575285
16 9700575
17 20435415
18 15054105
19 53999715
20 2282745465 

[1,3,4,15,21,45,75,465,1095,2145,4935,14955,80685,
 229845,1295325,1575285,9700575,20435415,15054105,
 53999715,2282745465]

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Last modified April 16 10:37 EDT 2024. Contains 371709 sequences. (Running on oeis4.)