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A198717 as a simple table

na(n)
11
24
334
4499
510507
6272410
77817980
8234638905
97176366133
10221220625936
116841771033846
12211886983790431
136565800345745279
14203504808219690982
156308194354577750032
16195548116214389189477
176061914804816147034345

[1,4,34,499,10507,272410,7817980,234638905,
 7176366133,221220625936,6841771033846,
 211886983790431,6565800345745279,
 203504808219690982,6308194354577750032,
 195548116214389189477,6061914804816147034345]