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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 15 |
| 3 | 148 |
| 4 | 2077 |
| 5 | 38326 |
| 6 | 883369 |
| 7 | 24431436 |
| 8 | 789531705 |
| 9 | 29213730010 |
| 10 | 1218401262541 |
| 11 | 56566561281616 |
| 12 | 2893886178904549 |
| 13 | 161768999193007974 |
| 14 | 9811122121462081281 |
| 15 | 641683497800057913556 |
| 16 | 45022670799746182036465 |
| 17 | 3373421864644139722767538 |
| 18 | 268843153008388446079159573 |
[1,3,15,148,2077,38326,883369,24431436,789531705, 29213730010,1218401262541,56566561281616, 2893886178904549,161768999193007974, 9811122121462081281,641683497800057913556, 45022670799746182036465,3373421864644139722767538, 268843153008388446079159573] |