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A286780 as a simple table

na(n)
01
12
26
312
420
540
6104
7208
8304
9608
101824
113648
127104
1314208
1419072
1538144
1676544
17153088
18303616
19607232
201235968
212471936
224728832
239457664
2418919424
2537838848
2675636736
27151273472
28302891008
29605782016
301220706304
312441412608
324882890752
339765781504

[1,2,6,12,20,40,104,208,304,608,1824,3648,7104,
 14208,19072,38144,76544,153088,303616,607232,
 1235968,2471936,4728832,9457664,18919424,37838848,
 75636736,151273472,302891008,605782016,1220706304,
 2441412608,4882890752,9765781504]