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A223585 as a simple table

na(n)
14
216
316
464
5256
664
7256
84096
94096
10256
111024
1265536
13204800
1465536
151024
164096
171048576
1810240000
1910240000
201048576
214096
2216384
2316777216
24512000000
251331200000
26512000000
2716777216
2816384
2965536
30268435456
3125600000000

[4,16,16,64,256,64,256,4096,4096,256,1024,65536,
 204800,65536,1024,4096,1048576,10240000,10240000,
 1048576,4096,16384,16777216,512000000,1331200000,
 512000000,16777216,16384,65536,268435456,
 25600000000]