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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 61 |
| 4 | 600 |
| 5 | 6072 |
| 6 | 65804 |
| 7 | 733435 |
| 8 | 8415694 |
| 9 | 98529785 |
| 10 | 1173278329 |
| 11 | 14162417506 |
| 12 | 172914841649 |
| 13 | 2131621288494 |
| 14 | 26495818020038 |
| 15 | 331706510158239 |
| 16 | 4178800564364333 |
| 17 | 52935845003315662 |
| 18 | 673878770026778330 |
| 19 | 8616336680850069832 |
| 20 | 110606714769468383785 |
| 21 | 1424933340070339610543 |
[1,1,8,61,600,6072,65804,733435,8415694,98529785, 1173278329,14162417506,172914841649,2131621288494, 26495818020038,331706510158239,4178800564364333, 52935845003315662,673878770026778330, 8616336680850069832,110606714769468383785, 1424933340070339610543] |