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A013615 as a simple table

na(n)
01
11
28
31
416
564
61
724
8192
9512
101
1132
12384
132048
144096
151
1640
17640
185120
1920480
2032768
211
2248
23960
2410240
2561440
26196608
27262144
281
2956
301344
3117920
32143360
33688128
341835008
352097152
361
3764
381792
3928672
40286720
411835008
427340032
4316777216
4416777216

[1,1,8,1,16,64,1,24,192,512,1,32,384,2048,4096,1,
 40,640,5120,20480,32768,1,48,960,10240,61440,
 196608,262144,1,56,1344,17920,143360,688128,
 1835008,2097152,1,64,1792,28672,286720,1835008,
 7340032,16777216,16777216]