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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 698 |
| 3 | 7466 |
| 4 | 68362 |
| 5 | 589990 |
| 6 | 4845178 |
| 7 | 38998648 |
| 8 | 306847534 |
| 9 | 2376142873 |
| 10 | 18172170592 |
| 11 | 137541600309 |
| 12 | 1032205229342 |
| 13 | 7690612680576 |
| 14 | 56948407735784 |
| 15 | 419460675116112 |
| 16 | 3075312381551048 |
| 17 | 22455267348093278 |
| 18 | 163373533509709066 |
[15,698,7466,68362,589990,4845178,38998648, 306847534,2376142873,18172170592,137541600309, 1032205229342,7690612680576,56948407735784, 419460675116112,3075312381551048, 22455267348093278,163373533509709066] |