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A087546 as a simple table

n a(n)
1 1
2 2
3 21
4 420
5 8820
6 3704400
7 32672808000
8 121033149955200000
9 3954492870121458201600000000
10 478624728546179688151541712568320000000000000 

[1,2,21,420,8820,3704400,32672808000,
 121033149955200000,3954492870121458201600000000,
 478624728546179688151541712568320000000000000]

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Last modified April 19 18:05 EDT 2024. Contains 371798 sequences. (Running on oeis4.)