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A273194 as a simple table

n a(n)
0 1
1 2
2 20
3 1120
4 30800
5 1121120
6 152472320
7 8277068800
8 523524601600
9 340290991040000
10 27631628472448000
11 2491870494969856000
12 741331472253532160000
13 80177849999112785920000
14 9392262428467497779200000
15 3554032102932101159649280000
16 480238587908700169197608960000

[1,2,20,1120,30800,1121120,152472320,8277068800,
 523524601600,340290991040000,27631628472448000,
 2491870494969856000,741331472253532160000,
 80177849999112785920000,9392262428467497779200000,
 3554032102932101159649280000,
 480238587908700169197608960000]

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Last modified March 29 08:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)