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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 9 |
| 3 | 17 |
| 4 | 61 |
| 5 | 245 |
| 6 | 877 |
| 7 | 3025 |
| 8 | 11357 |
| 9 | 56785 |
| 10 | 172369 |
| 11 | 635641 |
| 12 | 2538937 |
| 13 | 11331605 |
| 14 | 47564337 |
| 15 | 208241561 |
| 16 | 967197829 |
| 17 | 4595731157 |
| 18 | 21765558325 |
| 19 | 103101439417 |
| 20 | 494291376845 |
| 21 | 2471456884225 |
| 22 | 11682988812097 |
| 23 | 56743053605377 |
[5,9,17,61,245,877,3025,11357,56785,172369,635641, 2538937,11331605,47564337,208241561,967197829, 4595731157,21765558325,103101439417,494291376845, 2471456884225,11682988812097,56743053605377] |