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A298394 as a simple table

na(n)
15
249
3167
41915
513271
6117184
71142217
89792821
987882289
10805048388
117206559912
1264918770458
13587049492792
145291671622647
1547723002196470
16430610476512275
173884382910202786
1835040311217924940
19316098313514859630

[5,49,167,1915,13271,117184,1142217,9792821,
 87882289,805048388,7206559912,64918770458,
 587049492792,5291671622647,47723002196470,
 430610476512275,3884382910202786,
 35040311217924940,316098313514859630]