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A308669 as a simple table

na(n)
11
23
312
428
560
6124
7252
8510
91032
102070
114146
128298
1316602
1433210
1566426
16132858
17265722
18531450
191062906
202125818
214251642
228503290
2317006588
2434013180
2568026364
26136052736
27272105480
28544210964
291088421932
302176843872
314353687750
328707375506
3317414751018
3434829502042
3569659004090

[1,3,12,28,60,124,252,510,1032,2070,4146,8298,
 16602,33210,66426,132858,265722,531450,1062906,
 2125818,4251642,8503290,17006588,34013180,
 68026364,136052736,272105480,544210964,1088421932,
 2176843872,4353687750,8707375506,17414751018,
 34829502042,69659004090]