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A218806 as a simple table

na(n)
115
2249
33969
463499
51015887
616252713
7260019585
84159932363
966552822351
101064747639097
1117034402072321
12272525472991467
134360008241786383
1469753743236473129
151115957683030959873
1617853687738218017899

[15,249,3969,63499,1015887,16252713,260019585,
 4159932363,66552822351,1064747639097,
 17034402072321,272525472991467,4360008241786383,
 69753743236473129,1115957683030959873,
 17853687738218017899]