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A307051 as a simple table

na(n)
14
216
368
4256
51028
64112
77200
865536
9262148
10921600
111036800
121048592
1316777472
1488218000
15371404800
16418535784576

[4,16,68,256,1028,4112,7200,65536,262148,921600,
 1036800,1048592,16777472,88218000,371404800,
 418535784576]