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A122746 as a simple table

na(n)
01
12
26
312
428
556
6120
7240
8496
9992
102016
114032
128128
1316256
1432640
1565280
16130816
17261632
18523776
191047552
202096128
214192256
228386560
2316773120
2433550336
2567100672
26134209536
27268419072
28536854528
291073709056
302147450880
314294901760
328589869056

[1,2,6,12,28,56,120,240,496,992,2016,4032,8128,
 16256,32640,65280,130816,261632,523776,1047552,
 2096128,4192256,8386560,16773120,33550336,
 67100672,134209536,268419072,536854528,1073709056,
 2147450880,4294901760,8589869056]