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A171278 as a simple table

na(n)
14
216
362
4240
5914
63508
713297
850461
9191050
10722932
112726415
1210295319
1338671908
14146751022
15550500089
162073212701
177808201806
1829400052201
19110000818929

[4,16,62,240,914,3508,13297,50461,191050,722932,
 2726415,10295319,38671908,146751022,550500089,
 2073212701,7808201806,29400052201,110000818929]