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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 113 |
| 5 | 1525 |
| 6 | 57123 |
| 7 | 2165017 |
| 8 | 262621633 |
| 9 | 42422452969 |
| 10 | 14070212996451 |
| 11 | 7658246457672229 |
| 12 | 10650393355715621873 |
| 13 | 15512114571284835412957 |
| 14 | 75606222210863532170808003 |
| 15 | 452005526897888844293504165425 |
[1,1,3,13,113,1525,57123,2165017,262621633, 42422452969,14070212996451,7658246457672229, 10650393355715621873,15512114571284835412957, 75606222210863532170808003, 452005526897888844293504165425] |