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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 49 |
| 4 | 375 |
| 5 | 3181 |
| 6 | 29843 |
| 7 | 307833 |
| 8 | 3468671 |
| 9 | 42432445 |
| 10 | 560365779 |
| 11 | 7948580377 |
| 12 | 120557659247 |
| 13 | 1947336998829 |
| 14 | 33378478735475 |
| 15 | 605158251430681 |
| 16 | 11571369420832383 |
| 17 | 232739737871570173 |
| 18 | 4912330587789969971 |
| 19 | 108564708629365952505 |
| 20 | 2507303342099915104559 |
[0,1,7,49,375,3181,29843,307833,3468671,42432445, 560365779,7948580377,120557659247,1947336998829, 33378478735475,605158251430681,11571369420832383, 232739737871570173,4912330587789969971, 108564708629365952505,2507303342099915104559] |