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A045623 as a simple table

na(n)
01
12
25
312
428
564
6144
7320
8704
91536
103328
117168
1215360
1332768
1469632
15147456
16311296
17655360
181376256
192883584
206029312
2112582912
2226214400
2354525952
24113246208
25234881024
26486539264
271006632960
282080374784
294294967296
308858370048
3118253611008
3237580963840

[1,2,5,12,28,64,144,320,704,1536,3328,7168,15360,
 32768,69632,147456,311296,655360,1376256,2883584,
 6029312,12582912,26214400,54525952,113246208,
 234881024,486539264,1006632960,2080374784,
 4294967296,8858370048,18253611008,37580963840]