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A137704 as a simple table

na(n)
01
11
21
32
48
596
63456
7497664
8286654464
9825564856320
1011888133931008000
111027134771639091200000
12532466665617704878080000000
131932215036193527461576704000000000

[1,1,1,2,8,96,3456,497664,286654464,825564856320,
 11888133931008000,1027134771639091200000,
 532466665617704878080000000,
 1932215036193527461576704000000000]