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A299651 as a simple table

na(n)
116
2512
314981
4448993
513431706
6401989538
712030404350
8360039414559
910775053220325
10322469677661562
119650689326119101
12288820348973371780
138643651362044420950
14258682288630479728048
157741696610337244038767

[16,512,14981,448993,13431706,401989538,
 12030404350,360039414559,10775053220325,
 322469677661562,9650689326119101,
 288820348973371780,8643651362044420950,
 258682288630479728048,7741696610337244038767]