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A268235 as a simple table

na(n)
11
24
39
420
537
676
7141
8280
9541
101072
112097
124192
138289
1416548
1532953
1665860
17131397
18262764
19524909
201049736
212098381
224196560
238390865
2416781696
2533558929
2667117460
27134226585
28268452580
29536888037
301073775900
312147517725
324295034280
338590002605
3417180002736
3534359872001
3668719743792

[1,4,9,20,37,76,141,280,541,1072,2097,4192,8289,
 16548,32953,65860,131397,262764,524909,1049736,
 2098381,4196560,8390865,16781696,33558929,
 67117460,134226585,268452580,536888037,1073775900,
 2147517725,4295034280,8590002605,17180002736,
 34359872001,68719743792]