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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 306 |
| 3 | 5202 |
| 4 | 88434 |
| 5 | 1503378 |
| 6 | 25557426 |
| 7 | 434476242 |
| 8 | 7386095961 |
| 9 | 125563628736 |
| 10 | 2134581644448 |
| 11 | 36287887206528 |
| 12 | 616894069776480 |
| 13 | 10487198969713728 |
| 14 | 178282378804864032 |
| 15 | 3030800377118109696 |
| 16 | 51523605347410047672 |
[1,18,306,5202,88434,1503378,25557426,434476242, 7386095961,125563628736,2134581644448, 36287887206528,616894069776480,10487198969713728, 178282378804864032,3030800377118109696, 51523605347410047672] |