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A028307 as a simple table

na(n)
11
23
38
420
543
698
7212
8465
91000
102144
114497
129504
1319872
1441455
1585356
16178630
17363467
18757085
191541998
203183600
216515066
2213357593
2327432649
2455914902
25114683858
26233517515
27478061719
28972479046
291986013932

[1,3,8,20,43,98,212,465,1000,2144,4497,9504,19872,
 41455,85356,178630,363467,757085,1541998,3183600,
 6515066,13357593,27432649,55914902,114683858,
 233517515,478061719,972479046,1986013932]