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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 17 |
| 3 | 241 |
| 4 | 1285 |
| 5 | 4385 |
| 6 | 62177 |
| 7 | 331525 |
| 8 | 1131313 |
| 9 | 16041425 |
| 10 | 85532165 |
| 11 | 291874369 |
| 12 | 4138625473 |
| 13 | 22066967045 |
| 14 | 75302455889 |
| 15 | 1067749330609 |
| 16 | 5693191965445 |
| 17 | 19427741744993 |
| 18 | 275475188671649 |
| 19 | 1468821460117765 |
| 20 | 5012282067752305 |
| 21 | 71071530927954833 |
[5,17,241,1285,4385,62177,331525,1131313,16041425, 85532165,291874369,4138625473,22066967045, 75302455889,1067749330609,5693191965445, 19427741744993,275475188671649,1468821460117765, 5012282067752305,71071530927954833] |