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A178720 as a simple table

na(n)
13
28
312
428
558
6142
7350
8906
92320
106056
1115778
1241024
13107132
14280184
15732998
161918354
175019810
1813141378
1934398686
2090045424
21235729374
22617126438
231615633560
244229774958
2511073514332
2628990794770
2775898640094
28198704554772

[3,8,12,28,58,142,350,906,2320,6056,15778,41024,
 107132,280184,732998,1918354,5019810,13141378,
 34398686,90045424,235729374,617126438,1615633560,
 4229774958,11073514332,28990794770,75898640094,
 198704554772]