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| n | a(n) |
|---|---|
| 1 | 243 |
| 2 | 486 |
| 3 | 5118 |
| 4 | 37008 |
| 5 | 316800 |
| 6 | 2515716 |
| 7 | 20706696 |
| 8 | 167584476 |
| 9 | 1367432712 |
| 10 | 11114122476 |
| 11 | 90504770460 |
| 12 | 736322452020 |
| 13 | 5993199861276 |
| 14 | 48770296532280 |
| 15 | 396915186768744 |
| 16 | 3230114185683960 |
| 17 | 26287470177830052 |
| 18 | 213931378583656296 |
[243,486,5118,37008,316800,2515716,20706696, 167584476,1367432712,11114122476,90504770460, 736322452020,5993199861276,48770296532280, 396915186768744,3230114185683960, 26287470177830052,213931378583656296] |