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A336020 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 1
5 2
6 5
7 15
8 53
9 222
10 1115
11 6698
12 47243
13 382187
14 3480048
15 35251942
16 394839407
17 4875966656
18 66282636371
19 989985346269
20 16198580140543
21 289168351452220
22 5604120791540468
23 117309414122840454
24 2639927837211705159
25 63618153549702851338

[1,1,1,1,1,2,5,15,53,222,1115,6698,47243,382187,
 3480048,35251942,394839407,4875966656,66282636371,
 989985346269,16198580140543,289168351452220,
 5604120791540468,117309414122840454,
 2639927837211705159,63618153549702851338]

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Last modified April 22 22:19 EDT 2021. Contains 343197 sequences. (Running on oeis4.)