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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 73 |
| 4 | 649 |
| 5 | 8821 |
| 6 | 122311 |
| 7 | 2064637 |
| 8 | 37933393 |
| 9 | 773276329 |
| 10 | 17257075111 |
| 11 | 414876953041 |
| 12 | 10780187135257 |
| 13 | 298418920103773 |
| 14 | 8812636845668839 |
| 15 | 275368711393020421 |
| 16 | 9091457478119636641 |
| 17 | 315782978460465185617 |
| 18 | 11511089733834178827463 |
| 19 | 439231563093877354663129 |
[1,1,7,73,649,8821,122311,2064637,37933393, 773276329,17257075111,414876953041,10780187135257, 298418920103773,8812636845668839, 275368711393020421,9091457478119636641, 315782978460465185617,11511089733834178827463, 439231563093877354663129] |