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A240772 as a simple table

na(n)
15
2196
38319
4357943
515484811
6671539712
729164866719
81267677501494
955127359226486
102397991057304305
11104327512613317759
124539326052824027843
13197518541157705375152
148594849725702241760851
15374004476219684412455327

[5,196,8319,357943,15484811,671539712,29164866719,
 1267677501494,55127359226486,2397991057304305,
 104327512613317759,4539326052824027843,
 197518541157705375152,8594849725702241760851,
 374004476219684412455327]