The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 9 |
| 3 | 15 |
| 4 | 625 |
| 5 | 1225 |
| 6 | 3993 |
| 7 | 117649 |
| 8 | 218491 |
| 9 | 857375 |
| 10 | 3788435 |
| 11 | 4259571 |
| 12 | 69302975 |
| 13 | 136410197 |
| 14 | 200533921 |
| 15 | 313742585 |
| 16 | 603439225 |
| 17 | 1516358753 |
| 18 | 2563893625 |
| 19 | 3326174929 |
| 20 | 5655792025 |
| 21 | 10214476341 |
| 22 | 25937424601 |
| 23 | 29677977573 |
| 24 | 59797108943 |
| 25 | 283867750439 |
| 26 | 715167055525 |
[2,9,15,625,1225,3993,117649,218491,857375, 3788435,4259571,69302975,136410197,200533921, 313742585,603439225,1516358753,2563893625, 3326174929,5655792025,10214476341,25937424601, 29677977573,59797108943,283867750439,715167055525] |