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| n | a(n) |
|---|---|
| 2 | 6 |
| 3 | 675 |
| 4 | 34830 |
| 5 | 1347525 |
| 6 | 32145930 |
| 7 | 460513662 |
| 8 | 4464289944 |
| 9 | 32292364770 |
| 10 | 186464336850 |
| 11 | 900743450145 |
| 12 | 3764484413118 |
| 13 | 13954005203463 |
| 14 | 46750424936670 |
| 15 | 143665627355100 |
| 16 | 409707743053920 |
| 17 | 1094582930018724 |
| 18 | 2760817157366382 |
[6,675,34830,1347525,32145930,460513662, 4464289944,32292364770,186464336850,900743450145, 3764484413118,13954005203463,46750424936670, 143665627355100,409707743053920,1094582930018724, 2760817157366382] |