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A222520 as a simple table

na(n)
18
2114
31302
426513
5459702
615047384
7403328822
832347515041
91232881699540
10121450541699548
114853507073442748
12493976449729124341
1319993012391256769246
142032635985704237437326
1582875504826818513459334

[8,114,1302,26513,459702,15047384,403328822,
 32347515041,1232881699540,121450541699548,
 4853507073442748,493976449729124341,
 19993012391256769246,2032635985704237437326,
 82875504826818513459334]