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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 17 |
| 8 | 31 |
| 9 | 679 |
| 10 | 1365 |
| 11 | 17627 |
| 12 | 46035 |
| 13 | 1583863 |
| 14 | 5152353 |
| 15 | 644498775 |
| 16 | 2733408045 |
| 17 | 569392682481 |
| 18 | 3041130002347 |
| 19 | 940096451199787 |
| 20 | 6289498795341393 |
| 21 | 4314014762481308841 |
| 22 | 36346991541862011089 |
| 23 | 57204732976870800644143 |
[1,1,1,1,1,1,17,31,679,1365,17627,46035,1583863, 5152353,644498775,2733408045,569392682481, 3041130002347,940096451199787,6289498795341393, 4314014762481308841,36346991541862011089, 57204732976870800644143] |