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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 82 |
| 4 | 2304 |
| 5 | 232088 |
| 6 | 81639942 |
| 7 | 99425060368 |
| 8 | 421915147527984 |
| 9 | 6313762292901492960 |
| 10 | 337457827116687464134048 |
| 11 | 65175276571204939272971781496 |
| 12 | 45944813538624773942727094008288680 |
[1,3,10,82,2304,232088,81639942,99425060368, 421915147527984,6313762292901492960, 337457827116687464134048, 65175276571204939272971781496, 45944813538624773942727094008288680] |