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A222091 as a simple table

na(n)
18
2306
311698
4439979
516518325
6620167586
723285438194
8874320487561
932829136547878
101232675333611674
1146284755942965861
121737909791864677612
1365255401994426759727
142450223514629565888639
1592001505833953763778608

[8,306,11698,439979,16518325,620167586,
 23285438194,874320487561,32829136547878,
 1232675333611674,46284755942965861,
 1737909791864677612,65255401994426759727,
 2450223514629565888639,92001505833953763778608]