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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 67 |
| 4 | 289 |
| 5 | 5121 |
| 6 | 71731 |
| 7 | 861043 |
| 8 | 18134817 |
| 9 | 303946849 |
| 10 | 6724342531 |
| 11 | 146426154051 |
| 12 | 3533373668353 |
| 13 | 93259190078497 |
| 14 | 2489644674735219 |
| 15 | 75193364720030131 |
| 16 | 2265438714279130561 |
| 17 | 74716734198386887233 |
| 18 | 2543592184722884351107 |
| 19 | 90853513680763023292099 |
[1,1,3,67,289,5121,71731,861043,18134817, 303946849,6724342531,146426154051,3533373668353, 93259190078497,2489644674735219,75193364720030131, 2265438714279130561,74716734198386887233, 2543592184722884351107,90853513680763023292099] |