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A302676 as a simple table

na(n)
15
25
312
420
533
664
7121
8231
9440
10838
111597
123042
135796
1411042
1521037
1640079
1776357
18145473
19277150
20528017
211005960
221916521
233651291
246956316
2513252938
2625249049
2748103634
2891645416
29174599746
30332641529
31633737387
321207375029
332300250057
344382358586

[5,5,12,20,33,64,121,231,440,838,1597,3042,5796,
 11042,21037,40079,76357,145473,277150,528017,
 1005960,1916521,3651291,6956316,13252938,25249049,
 48103634,91645416,174599746,332641529,633737387,
 1207375029,2300250057,4382358586]