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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 9 |
| 5 | 31 |
| 6 | 403 |
| 7 | 757 |
| 8 | 2873 |
| 9 | 12607 |
| 10 | 333051 |
| 11 | 761377 |
| 12 | 3699435 |
| 13 | 16383121 |
| 14 | 108710085 |
| 15 | 4855474267 |
| 16 | 28123899993 |
| 17 | 241045678351 |
| 18 | 2865769028107 |
| 19 | 22701288941281 |
| 20 | 238433702214659 |
| 21 | 4399193720759677 |
| 22 | 46157742163810905 |
| 23 | 514035796837721671 |
| 24 | 8889375296702138075 |
[1,1,1,7,9,31,403,757,2873,12607,333051,761377, 3699435,16383121,108710085,4855474267,28123899993, 241045678351,2865769028107,22701288941281, 238433702214659,4399193720759677, 46157742163810905,514035796837721671, 8889375296702138075] |