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A094590 as a simple table

na(n)
11
21
32
46
518
654
7216
8864
93456
1013824
1155296
12221184
13884736
143538944
1514155776
1656623104
17226492416
18905969664
194529848320
2022649241600
21113246208000
22566231040000
232831155200000
2414155776000000
2570778880000000

[1,1,2,6,18,54,216,864,3456,13824,55296,221184,
 884736,3538944,14155776,56623104,226492416,
 905969664,4529848320,22649241600,113246208000,
 566231040000,2831155200000,14155776000000,
 70778880000000]