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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 65 |
| 5 | 8621 |
| 6 | 149184857 |
| 7 | 44551677001092773 |
| 8 | 3970578415163336458099984005568433 |
| 9 | 31532720313075764582758396083530822599715967108537469217279098897853 |
[1,1,1,5,65,8621,149184857,44551677001092773, 3970578415163336458099984005568433, 31532720313075764582758396083530822599715967108537\ 469217279098897853] |