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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 223 |
| 4 | 5045 |
| 5 | 154161 |
| 6 | 5949715 |
| 7 | 277816813 |
| 8 | 15234148585 |
| 9 | 959821848433 |
| 10 | 68333878996991 |
| 11 | 5425649143910733 |
| 12 | 475370226250388221 |
| 13 | 45559752911807595865 |
| 14 | 4741534923025152367627 |
| 15 | 532526268840445510805341 |
| 16 | 64198018232238090097818065 |
| 17 | 8268729272698380485865553761 |
[1,2,15,223,5045,154161,5949715,277816813, 15234148585,959821848433,68333878996991, 5425649143910733,475370226250388221, 45559752911807595865,4741534923025152367627, 532526268840445510805341, 64198018232238090097818065, 8268729272698380485865553761] |