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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 145 |
| 5 | 1663 |
| 6 | 24031 |
| 7 | 419521 |
| 8 | 8592417 |
| 9 | 202069759 |
| 10 | 5367258479 |
| 11 | 158934860321 |
| 12 | 5191969220945 |
| 13 | 185490468312767 |
| 14 | 7194912503747775 |
| 15 | 301130097048242561 |
| 16 | 13526711564792340289 |
| 17 | 649121580063333263359 |
| 18 | 33142745983169890692559 |
[1,3,17,145,1663,24031,419521,8592417,202069759, 5367258479,158934860321,5191969220945, 185490468312767,7194912503747775, 301130097048242561,13526711564792340289, 649121580063333263359,33142745983169890692559] |