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A125820 as a simple table

na(n)
11
21
399
4295
510193
649001
71086723
86926543
9119265217
10910405105
1113389536259
12115088367703
131528961752529
1414221495172249
15176752280339811
161732989592387775
1720610950377737217
18209321891217088609
192417905969074687267
2025140035386206969607

[1,1,99,295,10193,49001,1086723,6926543,119265217,
 910405105,13389536259,115088367703,1528961752529,
 14221495172249,176752280339811,1732989592387775,
 20610950377737217,209321891217088609,
 2417905969074687267,25140035386206969607]