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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 18 |
| 3 | 250 |
| 4 | 4520 |
| 5 | 99351 |
| 6 | 2556806 |
| 7 | 75190410 |
| 8 | 2483617140 |
| 9 | 90955908010 |
| 10 | 3655774038653 |
| 11 | 159938142409890 |
| 12 | 7564604603286913 |
| 13 | 384576889110665055 |
| 14 | 20912407157570989950 |
| 15 | 1211142337261176799610 |
| 16 | 74427504634177621877538 |
[1,2,18,250,4520,99351,2556806,75190410, 2483617140,90955908010,3655774038653, 159938142409890,7564604603286913, 384576889110665055,20912407157570989950, 1211142337261176799610,74427504634177621877538] |