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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 36 |
| 2 | 825 |
| 3 | 16016 |
| 4 | 286650 |
| 5 | 4900896 |
| 6 | 81477396 |
| 7 | 1330243200 |
| 8 | 21455160012 |
| 9 | 343138081000 |
| 10 | 5455289950110 |
| 11 | 86359817849760 |
| 12 | 1362899694292500 |
| 13 | 21460589553110400 |
| 14 | 337374701839395000 |
| 15 | 5297540558850547200 |
| 16 | 83114164698623615700 |
| 17 | 1303247055281641470000 |
| 18 | 20427480491760087405660 |
[1,36,825,16016,286650,4900896,81477396, 1330243200,21455160012,343138081000,5455289950110, 86359817849760,1362899694292500,21460589553110400, 337374701839395000,5297540558850547200, 83114164698623615700,1303247055281641470000, 20427480491760087405660] |