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A147539 as a simple table

na(n)
15
299
31799
430735
5507935
68257599
7133169279
82139095295
934292630015
10549218943999
118791798056959
12140703128621055
132251524935786495
1436026597995724799
15576443160117411839
169223231299366486015

[5,99,1799,30735,507935,8257599,133169279,
 2139095295,34292630015,549218943999,8791798056959,
 140703128621055,2251524935786495,
 36026597995724799,576443160117411839,
 9223231299366486015]