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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 76 |
| 5 | 961 |
| 6 | 15407 |
| 7 | 221528 |
| 8 | 3260936 |
| 9 | 80774113 |
| 10 | 2462081967 |
| 11 | 50963779604 |
| 12 | 922244742292 |
| 13 | 61063845514113 |
| 14 | 2868669700179871 |
| 15 | 2019727494212912 |
| 16 | -47889136910252848 |
| 17 | 461395118866593115713 |
| 18 | 5781219348638565771423 |
| 19 | -2108738296748190078596084 |
[1,1,3,12,76,961,15407,221528,3260936,80774113, 2462081967,50963779604,922244742292, 61063845514113,2868669700179871,2019727494212912, -47889136910252848,461395118866593115713, 5781219348638565771423,-2108738296748190078596084] |