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A181800 as a simple table

na(n)
11
24
38
416
532
636
764
872
9128
10144
11216
12256
13288
14432
15512
16576
17864
18900
191024
201152
211296
221728
231800
242048
252304
262592
273456
283600
294096
304608
315184
325400
336912
347200
357776
368192
379216
3810368
3910800
4013824
4114400
4215552
4316384
4418432
4520736
4621600
4727000

[1,4,8,16,32,36,64,72,128,144,216,256,288,432,512,
 576,864,900,1024,1152,1296,1728,1800,2048,2304,
 2592,3456,3600,4096,4608,5184,5400,6912,7200,7776,
 8192,9216,10368,10800,13824,14400,15552,16384,
 18432,20736,21600,27000]