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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 84 |
| 3 | 668 |
| 4 | 5070 |
| 5 | 42104 |
| 6 | 326010 |
| 7 | 2511252 |
| 8 | 19430715 |
| 9 | 152135920 |
| 10 | 1190465282 |
| 11 | 9289762532 |
| 12 | 72404777123 |
| 13 | 564819519982 |
| 14 | 4409093385085 |
| 15 | 34418864675001 |
| 16 | 268626308705377 |
| 17 | 2096420912100320 |
| 18 | 16362151427663928 |
| 19 | 127710770440282286 |
[16,84,668,5070,42104,326010,2511252,19430715, 152135920,1190465282,9289762532,72404777123, 564819519982,4409093385085,34418864675001, 268626308705377,2096420912100320, 16362151427663928,127710770440282286] |