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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 37 |
| 4 | 533 |
| 5 | 1627 |
| 6 | 18107 |
| 7 | 237371 |
| 8 | 95549 |
| 9 | 1632341 |
| 10 | 155685007 |
| 11 | 156188887 |
| 12 | 3602044091 |
| 13 | 18051406831 |
| 14 | 54260455193 |
| 15 | 225175759291 |
| 16 | 13981692518567 |
| 17 | 14000078506967 |
| 18 | 98115155543129 |
| 19 | 3634060848592973 |
| 20 | 3637485804655193 |
[1,7,37,533,1627,18107,237371,95549,1632341, 155685007,156188887,3602044091,18051406831, 54260455193,225175759291,13981692518567, 14000078506967,98115155543129,3634060848592973, 3637485804655193] |