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A013628 as a simple table

na(n)
01
14
25
316
440
525
664
7240
8300
9125
10256
111280
122400
132000
14625
151024
166400
1716000
1820000
1912500
203125
214096
2230720
2396000
24160000
25150000
2675000
2715625
2816384
29143360
30537600
311120000
321400000
331050000
34437500
3578125
3665536

[1,4,5,16,40,25,64,240,300,125,256,1280,2400,2000,
 625,1024,6400,16000,20000,12500,3125,4096,30720,
 96000,160000,150000,75000,15625,16384,143360,
 537600,1120000,1400000,1050000,437500,78125,65536]