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A152697 as a simple table

na(n)
11
22
36
424
5120
6720
75040
840320
9362880
103456000
1135576640
12391828608
134689764832
1459951832064
15817642441280
1612096591891520

[1,2,6,24,120,720,5040,40320,362880,3456000,
 35576640,391828608,4689764832,59951832064,
 817642441280,12096591891520]