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A220027 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 12
5 60
6 180
7 1260
8 5040
9 5040
10 25200
11 277200
12 2494800
13 32432400
14 227026800
15 227026800
16 3632428800
17 61751289600
18 61751289600
19 1173274502400
20 29331862560000
21 29331862560000
22 322650488160000
23 7420961227680000
24 601097859442080000
25 601097859442080000

[1,1,2,6,12,60,180,1260,5040,5040,25200,277200,
 2494800,32432400,227026800,227026800,3632428800,
 61751289600,61751289600,1173274502400,
 29331862560000,29331862560000,322650488160000,
 7420961227680000,601097859442080000,
 601097859442080000]

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Last modified March 28 13:21 EDT 2024. Contains 371254 sequences. (Running on oeis4.)