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A203228 as a simple table

n a(n)
1 1
2 3
3 20
4 492
5 59328
6 42750720
7 215488512000
8 8688622215168000
9 3152932286024908800000
10 11441362514460661304524800000
11 456702585875829909265192058880000000
12 218761269624450195162273767321763840000000000

[1,3,20,492,59328,42750720,215488512000,
 8688622215168000,3152932286024908800000,
 11441362514460661304524800000,
 456702585875829909265192058880000000,
 218761269624450195162273767321763840000000000]

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Last modified January 23 13:57 EST 2022. Contains 350511 sequences. (Running on oeis4.)