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A219524 as a simple table

na(n)
18
218
3124
41090
56994
642906
7241413
81327694
97148589
1037181863
11185383785
12881615968
134010119499
1417516997873
1573780512955
16300596497963
171187489293042
184557540770898
1917022492697401
2061969041626283
21220187547195208

[8,18,124,1090,6994,42906,241413,1327694,7148589,
 37181863,185383785,881615968,4010119499,
 17516997873,73780512955,300596497963,
 1187489293042,4557540770898,17022492697401,
 61969041626283,220187547195208]