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A300608 as a simple table

na(n)
12
230
3277
42347
519532
6164619
71387896
811697909
998591087
10830954473
117003554684
1259028229212
13497509382092
144193173792143
1535341458756838
16297869535158874
172510543242339775
1821159691214336637
19178340896550028412

[2,30,277,2347,19532,164619,1387896,11697909,
 98591087,830954473,7003554684,59028229212,
 497509382092,4193173792143,35341458756838,
 297869535158874,2510543242339775,
 21159691214336637,178340896550028412]