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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 51 |
| 2 | 805 |
| 3 | 12868 |
| 4 | 205888 |
| 5 | 3294199 |
| 6 | 52707179 |
| 7 | 843314857 |
| 8 | 13493037705 |
| 9 | 215888603273 |
| 10 | 3454217652358 |
| 11 | 55267482437723 |
| 12 | 884279719003556 |
| 13 | 14148475504056881 |
| 14 | 226375608064910089 |
| 15 | 3622009729038561422 |
| 16 | 57952155664616982740 |
| 17 | 927234490633871723826 |
| 18 | 14835751850141947581204 |
[4,51,805,12868,205888,3294199,52707179,843314857, 13493037705,215888603273,3454217652358, 55267482437723,884279719003556,14148475504056881, 226375608064910089,3622009729038561422, 57952155664616982740,927234490633871723826, 14835751850141947581204] |