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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 13 |
| 3 | 37 |
| 4 | 73 |
| 5 | 1021 |
| 6 | 2917 |
| 7 | 15013 |
| 8 | 49681 |
| 9 | 532801 |
| 10 | 1065601 |
| 11 | 8524807 |
| 12 | 68198461 |
| 13 | 545587687 |
| 14 | 1704961513 |
| 15 | 23869461181 |
| 16 | 288310406533 |
| 17 | 1833174628057 |
| 18 | 3666349256113 |
| 19 | 65994286610033 |
[2,13,37,73,1021,2917,15013,49681,532801,1065601, 8524807,68198461,545587687,1704961513,23869461181, 288310406533,1833174628057,3666349256113, 65994286610033] |