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A139756 as a simple table

na(n)
00
10
21
34
412
532
680
7192
8448
91024
102304
115120
1211264
1324576
1453248
15114688
16245760
17524288
181114112
192359296
204980736
2110485760
2222020096
2346137344
2496468992
25201326592
26419430400
27872415232
281811939328
293758096384
307784628224
3116106127360
3233285996544

[0,0,1,4,12,32,80,192,448,1024,2304,5120,11264,
 24576,53248,114688,245760,524288,1114112,2359296,
 4980736,10485760,22020096,46137344,96468992,
 201326592,419430400,872415232,1811939328,
 3758096384,7784628224,16106127360,33285996544]