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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 67 |
| 5 | 627 |
| 6 | 7781 |
| 7 | 117652 |
| 8 | 2097159 |
| 9 | 43046725 |
| 10 | 1000000009 |
| 11 | 25937424606 |
| 12 | 743008370699 |
| 13 | 23298085122487 |
| 14 | 793714773254157 |
| 15 | 29192926025390632 |
| 16 | 1152921504606846991 |
| 17 | 48661191875666868489 |
| 18 | 2185911559738696531985 |
[1,3,10,67,627,7781,117652,2097159,43046725, 1000000009,25937424606,743008370699, 23298085122487,793714773254157,29192926025390632, 1152921504606846991,48661191875666868489, 2185911559738696531985] |