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A306898 as a simple table

na(n)
12
28
312
432
540
696
7140
8320
9540
101120
112068
124320
138216
1416688
1532880
1666176
17131104
18263376
19524324
201050880
212097480
224198480
238388652
2416786368
2533554600
2667125344
27134218836
28268468928
29536870968
301073809920
312147483708
324295099648
338589938808
3417180131456
3534359739120
3668720011776

[2,8,12,32,40,96,140,320,540,1120,2068,4320,8216,
 16688,32880,66176,131104,263376,524324,1050880,
 2097480,4198480,8388652,16786368,33554600,
 67125344,134218836,268468928,536870968,1073809920,
 2147483708,4295099648,8589938808,17180131456,
 34359739120,68720011776]