A177297 - OEIS

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A177297 as a simple table

n	a(n)
0	1
1	1
2	20
3	1680
4	369600
5	168168000
6	137225088000
7	182509367040000
8	369398958888960000
9	510778379991559680000

[1,1,20,1680,369600,168168000,137225088000, 182509367040000,369398958888960000, 510778379991559680000]