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A128501 as a simple table

n a(n)
0 1
1 1
2 2
3 2
4 4
5 20
6 20
7 140
8 280
9 280
10 280
11 3080
12 3080
13 40040
14 40040
15 40040
16 80080
17 1361360
18 1361360
19 25865840
20 25865840
21 25865840
22 25865840
23 594914320
24 594914320
25 2974571600
26 2974571600
27 2974571600
28 2974571600
29 86262576400

[1,1,2,2,4,20,20,140,280,280,280,3080,3080,40040,
 40040,40040,80080,1361360,1361360,25865840,
 25865840,25865840,25865840,594914320,594914320,
 2974571600,2974571600,2974571600,2974571600,
 86262576400]

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Last modified May 10 05:10 EDT 2021. Contains 343748 sequences. (Running on oeis4.)