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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 271 |
| 4 | 5649 |
| 5 | 174051 |
| 6 | 7447573 |
| 7 | 422836191 |
| 8 | 30767443521 |
| 9 | 2792343036259 |
| 10 | 309252314731701 |
| 11 | 41051709426337743 |
| 12 | 6434479982900111761 |
| 13 | 1175819833620882461571 |
| 14 | 247785659825802622964469 |
| 15 | 59649892258930263778729951 |
| 16 | 16268290830606063971956320513 |
[1,3,21,271,5649,174051,7447573,422836191, 30767443521,2792343036259,309252314731701, 41051709426337743,6434479982900111761, 1175819833620882461571,247785659825802622964469, 59649892258930263778729951, 16268290830606063971956320513] |