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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 56 |
| 3 | 576 |
| 4 | 6016 |
| 5 | 62976 |
| 6 | 659456 |
| 7 | 6905856 |
| 8 | 72318976 |
| 9 | 757334016 |
| 10 | 7930904576 |
| 11 | 83053510656 |
| 12 | 869747654656 |
| 13 | 9108115685376 |
| 14 | 95381425750016 |
| 15 | 998847258034176 |
| 16 | 10460064284409856 |
| 17 | 109539215284371456 |
| 18 | 1147109554861899776 |
[1,6,56,576,6016,62976,659456,6905856,72318976, 757334016,7930904576,83053510656,869747654656, 9108115685376,95381425750016,998847258034176, 10460064284409856,109539215284371456, 1147109554861899776] |