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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 163 |
| 4 | 3593 |
| 5 | 87501 |
| 6 | 2266155 |
| 7 | 61211095 |
| 8 | 1704838665 |
| 9 | 48605519665 |
| 10 | 1411522695509 |
| 11 | 41606511550803 |
| 12 | 1241591466423467 |
| 13 | 37435593955828069 |
| 14 | 1138713916992923679 |
| 15 | 34901292375152457663 |
| 16 | 1076813644170756916745 |
| 17 | 33416749492077957930105 |
| 18 | 1042376218505671236116985 |
[1,1,9,163,3593,87501,2266155,61211095,1704838665, 48605519665,1411522695509,41606511550803, 1241591466423467,37435593955828069, 1138713916992923679,34901292375152457663, 1076813644170756916745,33416749492077957930105, 1042376218505671236116985] |