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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 31 |
| 4 | 573 |
| 5 | 18031 |
| 6 | 854613 |
| 7 | 57433951 |
| 8 | 5242645173 |
| 9 | 625589806831 |
| 10 | 95051257799973 |
| 11 | 17976303383444671 |
| 12 | 4153215615930529173 |
| 13 | 1154304694449774708751 |
| 14 | 380809177225169291456133 |
| 15 | 147420687475847638142996191 |
| 16 | 66303807316628093952943203573 |
[1,1,3,31,573,18031,854613,57433951,5242645173, 625589806831,95051257799973,17976303383444671, 4153215615930529173,1154304694449774708751, 380809177225169291456133, 147420687475847638142996191, 66303807316628093952943203573] |