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A020584 as a simple table

na(n)
01
124
2388
35280
465296
5760704
68515648
792705280
8989122816
910397865984
10108092228608
111114193633280
1211410283892736
13116262680100864
141179983894560768
1511939165879009280
16120509095367213056

[1,24,388,5280,65296,760704,8515648,92705280,
 989122816,10397865984,108092228608,1114193633280,
 11410283892736,116262680100864,1179983894560768,
 11939165879009280,120509095367213056]