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A167881 as a simple table

na(n)
01
13
26
312
424
548
696
7192
8384
9768
101536
113072
126144
1312288
1424576
1549152
1698301
17196596
18393183
19786348
201572660
213145248
226290352
2312580416
2425160256
2550319360
26100636416
27201268224
28402527232
29805036032
301610035200
313219996672

[1,3,6,12,24,48,96,192,384,768,1536,3072,6144,
 12288,24576,49152,98301,196596,393183,786348,
 1572660,3145248,6290352,12580416,25160256,
 50319360,100636416,201268224,402527232,805036032,
 1610035200,3219996672]