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A178167 as a simple table

na(n)
13
28
320
450
5122
6290
7674
81538
93462
107720
1117104
1237708
1382768
14180880
15393488
16851914
171835470
183935808
198402158
2017865738
2137858268
2279991512
23168605710
24354649382
25744605426
261560666296
273265699888
286822355756
2914229565634

[3,8,20,50,122,290,674,1538,3462,7720,17104,37708,
 82768,180880,393488,851914,1835470,3935808,
 8402158,17865738,37858268,79991512,168605710,
 354649382,744605426,1560666296,3265699888,
 6822355756,14229565634]