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A264707 as a simple table

na(n)
11
21
34
428
5176
61600
716128
8124416
91446336
1035831808
111074954240
1227136622592
13711858585600
1416840949760000
15456855552000000
1622466543616000000

[1,1,4,28,176,1600,16128,124416,1446336,35831808,
 1074954240,27136622592,711858585600,
 16840949760000,456855552000000,22466543616000000]