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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 131 |
| 5 | 4203 |
| 6 | 331201 |
| 7 | 64663638 |
| 8 | 31352026159 |
| 9 | 37776715520590 |
| 10 | 113247016996007525 |
| 11 | 846271790301299050986 |
| 12 | 15805460204542771053508658 |
| 13 | 740016466929577536283427715626 |
[1,2,10,131,4203,331201,64663638,31352026159, 37776715520590,113247016996007525, 846271790301299050986,15805460204542771053508658, 740016466929577536283427715626] |