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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 247 |
| 4 | 2279 |
| 5 | 9167 |
| 6 | 57479 |
| 7 | 200479 |
| 8 | 518039 |
| 9 | 2119207 |
| 10 | 3685439 |
| 11 | 9240079 |
| 12 | 16384279 |
| 13 | 31536647 |
| 14 | 101601359 |
| 15 | 140558807 |
| 16 | 189771287 |
| 17 | 299142967 |
| 18 | 354032447 |
| 19 | 384150199 |
| 20 | 486103279 |
| 21 | 565468637 |
| 22 | 802008239 |
| 23 | 853795074 |
| 24 | 1107541759 |
| 25 | 1328438479 |
| 26 | 1494742004 |
| 27 | 1580837719 |
| 28 | 1768013279 |
[1,2,247,2279,9167,57479,200479,518039,2119207, 3685439,9240079,16384279,31536647,101601359, 140558807,189771287,299142967,354032447,384150199, 486103279,565468637,802008239,853795074, 1107541759,1328438479,1494742004,1580837719, 1768013279] |