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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 65 |
| 3 | 1036 |
| 4 | 16511 |
| 5 | 263140 |
| 6 | 4193729 |
| 7 | 66836524 |
| 8 | 1065190655 |
| 9 | 16976213956 |
| 10 | 270554232641 |
| 11 | 4311891508300 |
| 12 | 68719709900159 |
| 13 | 1095203466894244 |
| 14 | 17454535760407745 |
| 15 | 278177368699629676 |
| 16 | 4433383363433667071 |
| 17 | 70655956446239043460 |
| 18 | 1126061919776391028289 |
| 19 | 17946334759976017409164 |
[4,65,1036,16511,263140,4193729,66836524, 1065190655,16976213956,270554232641,4311891508300, 68719709900159,1095203466894244,17454535760407745, 278177368699629676,4433383363433667071, 70655956446239043460,1126061919776391028289, 17946334759976017409164] |