| n | a(n) |
|---|---|
| 3 | 3 |
| 4 | 34 |
| 5 | 260 |
| 6 | 1721 |
| 7 | 10808 |
| 8 | 67376 |
| 9 | 427449 |
| 10 | 2798432 |
| 11 | 19042144 |
| 12 | 135083103 |
| 13 | 999573770 |
| 14 | 7709458472 |
| 15 | 61890269371 |
| 16 | 516304085366 |
| 17 | 4468459583648 |
| 18 | 40058286666913 |
| 19 | 371420337948828 |
| 20 | 3556972620397996 |
| 21 | 35138563919933649 |
| 22 | 357654826207771292 |
| 23 | 3746672499505598556 |
| 24 | 40354065576745998303 |
[3,34,260,1721,10808,67376,427449,2798432, 19042144,135083103,999573770,7709458472, 61890269371,516304085366,4468459583648, 40058286666913,371420337948828,3556972620397996, 35138563919933649,357654826207771292, 3746672499505598556,40354065576745998303] |