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A188868 as a simple table

na(n)
17
249
3316
42032
513045
683737
7537496
83450100
922145617
10142149013
11912430732
125856740200
1337593435373
14241305971377
151548902653984
169942146967292
1763816977822953
18409630502531629
192629349654724052
2016877355480293296

[7,49,316,2032,13045,83737,537496,3450100,
 22145617,142149013,912430732,5856740200,
 37593435373,241305971377,1548902653984,
 9942146967292,63816977822953,409630502531629,
 2629349654724052,16877355480293296]