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A280373 as a simple table

na(n)
01
12
25
38
416
540
684
7130
8257
9640
101344
112080
124096
1310240
1421504
1533280
1665536
17163840
18344064
19532480
201048576
212621440
225505024
238519680
2416777216
2541943040
2688080384
27136314880
28268435456
29671088640
301409286144
312181038080
324294967296
3310737418240

[1,2,5,8,16,40,84,130,257,640,1344,2080,4096,
 10240,21504,33280,65536,163840,344064,532480,
 1048576,2621440,5505024,8519680,16777216,41943040,
 88080384,136314880,268435456,671088640,1409286144,
 2181038080,4294967296,10737418240]