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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 217 |
| 4 | 4085 |
| 5 | 82593 |
| 6 | 1751197 |
| 7 | 38413481 |
| 8 | 864413317 |
| 9 | 19842830065 |
| 10 | 462825376685 |
| 11 | 10937407206265 |
| 12 | 261311076852245 |
| 13 | 6301225556698177 |
| 14 | 153160687795008445 |
| 15 | 3748598210810053449 |
| 16 | 92303640047399410341 |
| 17 | 2285025852515378528913 |
| 18 | 56836898766186234593485 |
[1,1,13,217,4085,82593,1751197,38413481,864413317, 19842830065,462825376685,10937407206265, 261311076852245,6301225556698177, 153160687795008445,3748598210810053449, 92303640047399410341,2285025852515378528913, 56836898766186234593485] |