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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 306 |
| 3 | 5202 |
| 4 | 88434 |
| 5 | 1503378 |
| 6 | 25557426 |
| 7 | 434476089 |
| 8 | 7386090912 |
| 9 | 125563501440 |
| 10 | 2134578775392 |
| 11 | 36287826447168 |
| 12 | 616892833115424 |
| 13 | 10487174482692864 |
| 14 | 178281903641223096 |
| 15 | 3030791298303722112 |
| 16 | 51523433990019421056 |
[1,18,306,5202,88434,1503378,25557426,434476089, 7386090912,125563501440,2134578775392, 36287826447168,616892833115424,10487174482692864, 178281903641223096,3030791298303722112, 51523433990019421056] |