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A259275 as a simple table

n a(n)
0 1
1 5
2 20
3 105
4 520
5 2580
6 12945
7 64680
8 323320
9 1616780
10 8083745
11 40418380
12 202092620
13 1010462480
14 5052310420
15 25261556205
16 126307777920
17 631538879180
18 3157694416720
19 15788472066780
20 78942360284720
21 394711801527505
22 1973559007551520
23 9867795037511480
24 49338975188073020

[1,5,20,105,520,2580,12945,64680,323320,1616780,
 8083745,40418380,202092620,1010462480,5052310420,
 25261556205,126307777920,631538879180,
 3157694416720,15788472066780,78942360284720,
 394711801527505,1973559007551520,9867795037511480,
 49338975188073020]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)