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A309181 as a simple table

na(n)
01
14
28
316
424
536
648
7256
872
91024
10180
11144
12216
1316384
14288
1565536
16360
17576
183072
19900
20864
211296
22720
232304
241080
2567108864
262592
27268435456
281440
299216
30196608
315184
322160
3317179869184
342880
3536864
3610368
373600
386300
391099511627776
404320
4120736
426480

[1,4,8,16,24,36,48,256,72,1024,180,144,216,16384,
 288,65536,360,576,3072,900,864,1296,720,2304,1080,
 67108864,2592,268435456,1440,9216,196608,5184,
 2160,17179869184,2880,36864,10368,3600,6300,
 1099511627776,4320,20736,6480]