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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 26 |
| 4 | 182 |
| 5 | 1737 |
| 6 | 21345 |
| 7 | 320938 |
| 8 | 5701778 |
| 9 | 116812889 |
| 10 | 2710555349 |
| 11 | 70256770866 |
| 12 | 2011763864406 |
| 13 | 63066746422417 |
| 14 | 2148275748236033 |
| 15 | 79009709388692498 |
| 16 | 3120334201617871778 |
| 17 | 131703367127423550129 |
| 18 | 5916556161455825857509 |
| 19 | 281857608793034773225930 |
[1,5,26,182,1737,21345,320938,5701778,116812889, 2710555349,70256770866,2011763864406, 63066746422417,2148275748236033,79009709388692498, 3120334201617871778,131703367127423550129, 5916556161455825857509,281857608793034773225930] |