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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 57 |
| 4 | 2309 |
| 5 | 292103 |
| 6 | 90647411 |
| 7 | 37593032352 |
| 8 | 16429342163157 |
| 9 | 6925787777638463 |
| 10 | 2729333815881686935 |
| 11 | 995740669987430403414 |
| 12 | 335945077218184962957540 |
| 13 | 105067580130605231781256012 |
[1,1,6,57,2309,292103,90647411,37593032352, 16429342163157,6925787777638463, 2729333815881686935,995740669987430403414, 335945077218184962957540, 105067580130605231781256012] |