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A108628 as a simple table

na(n)
01
17
255
3471
44251
539733
6380731
73716695
836808723
9368750757
103728940249
1138003358693
12389866749975
134022124746409
1441697566691555
15434124925278807
164536783726146499
1747569453938399445
18500266519237489357
195275183203229043221
2055760274296452936741

[1,7,55,471,4251,39733,380731,3716695,36808723,
 368750757,3728940249,38003358693,389866749975,
 4022124746409,41697566691555,434124925278807,
 4536783726146499,47569453938399445,
 500266519237489357,5275183203229043221,
 55760274296452936741]