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A190901 as a simple table

na(n)
01
11
28
315
4384
5945
646080
7135135
810321920
934459425
103715891200
1113749310575
121961990553600
137905853580625
141428329123020800
156190283353629375
161371195958099968000
176332659870762850625
181678343852714360832000

[1,1,8,15,384,945,46080,135135,10321920,34459425,
 3715891200,13749310575,1961990553600,
 7905853580625,1428329123020800,6190283353629375,
 1371195958099968000,6332659870762850625,
 1678343852714360832000]