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A199090 as a simple table

na(n)
15
2420
344837
45471810
5726413391
6101787127746
714800090575471
82211229549716802
9337343474770282699
1052327061345761775192

[5,420,44837,5471810,726413391,101787127746,
 14800090575471,2211229549716802,
 337343474770282699,52327061345761775192]