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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 120 |
| 4 | 16257 |
| 5 | 22426576 |
| 6 | 181974299842 |
| 7 | 15238138790731690 |
| 8 | 8413234043413844801094 |
| 9 | 36597622942948070873495055416 |
| 10 | 1557743574279376981523155294991683637 |
| 11 | 377269728353963189455845962558983304322979834 |
[1,2,7,120,16257,22426576,181974299842, 15238138790731690,8413234043413844801094, 36597622942948070873495055416, 1557743574279376981523155294991683637, 377269728353963189455845962558983304322979834] |