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A331407 as a simple table

na(n)
11
22
38
432
5128
6864
73456
87776
931104
10279936
11497664
121990656
134478976
1417915904
1562208000
1697200000
17559872000
18874800000
191555200000
206220800000
2113996800000
2255987200000

[1,2,8,32,128,864,3456,7776,31104,279936,497664,
 1990656,4478976,17915904,62208000,97200000,
 559872000,874800000,1555200000,6220800000,
 13996800000,55987200000]