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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 229 |
| 4 | 3393 |
| 5 | 63591 |
| 6 | 1442173 |
| 7 | 38398641 |
| 8 | 1174226049 |
| 9 | 40558249963 |
| 10 | 1561734494661 |
| 11 | 66335687785533 |
| 12 | 3081211226192641 |
| 13 | 155369391396527439 |
| 14 | 8452596370942940973 |
| 15 | 493494408990278911561 |
| 16 | 30777323181433121541633 |
| 17 | 2042075395611656190239571 |
[1,3,21,229,3393,63591,1442173,38398641, 1174226049,40558249963,1561734494661, 66335687785533,3081211226192641, 155369391396527439,8452596370942940973, 493494408990278911561,30777323181433121541633, 2042075395611656190239571] |