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A264196 as a simple table

na(n)
12
218
3180
4864
54608
629040
7184525
81089000
96480000
1039335400
11238918849
121439151168
138674025472
1452415185536
15316746710820
161912128349230
1711543580054050
1869713595928295
19421013268028981
202542224621830400

[2,18,180,864,4608,29040,184525,1089000,6480000,
 39335400,238918849,1439151168,8674025472,
 52415185536,316746710820,1912128349230,
 11543580054050,69713595928295,421013268028981,
 2542224621830400]