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| n | a(n) |
|---|---|
| 0 | 5 |
| 1 | 0 |
| 2 | 9 |
| 3 | 81 |
| 4 | 297 |
| 5 | 891 |
| 6 | 1683 |
| 7 | 8019 |
| 8 | 5049 |
| 9 | 18513 |
| 10 | 15147 |
| 11 | 88209 |
| 12 | 31977 |
| 13 | 1185921 |
| 14 | 136323 |
| 15 | 166617 |
| 16 | 95931 |
| 17 | 7144929 |
| 18 | 351747 |
[5,0,9,81,297,891,1683,8019,5049,18513,15147, 88209,31977,1185921,136323,166617,95931,7144929, 351747] |